Quantcast
4S Ranch Allied Gardens Alpine Baja Balboa Park Bankers Hill Barrio Logan Bay Ho Bay Park Black Mountain Ranch Blossom Valley Bonita Bonsall Borrego Springs Boulevard Campo Cardiff-by-the-Sea Carlsbad Carmel Mountain Carmel Valley Chollas View Chula Vista City College City Heights Clairemont College Area Coronado CSU San Marcos Cuyamaca College Del Cerro Del Mar Descanso Downtown San Diego Eastlake East Village El Cajon Emerald Hills Encanto Encinitas Escondido Fallbrook Fletcher Hills Golden Hill Grant Hill Grantville Grossmont College Guatay Harbor Island Hillcrest Imperial Beach Imperial Valley Jacumba Jamacha-Lomita Jamul Julian Kearny Mesa Kensington La Jolla Lakeside La Mesa Lemon Grove Leucadia Liberty Station Lincoln Acres Lincoln Park Linda Vista Little Italy Logan Heights Mesa College Midway District MiraCosta College Miramar Miramar College Mira Mesa Mission Beach Mission Hills Mission Valley Mountain View Mount Hope Mount Laguna National City Nestor Normal Heights North Park Oak Park Ocean Beach Oceanside Old Town Otay Mesa Pacific Beach Pala Palomar College Palomar Mountain Paradise Hills Pauma Valley Pine Valley Point Loma Point Loma Nazarene Potrero Poway Rainbow Ramona Rancho Bernardo Rancho Penasquitos Rancho San Diego Rancho Santa Fe Rolando San Carlos San Marcos San Onofre Santa Ysabel Santee San Ysidro Scripps Ranch SDSU Serra Mesa Shelltown Shelter Island Sherman Heights Skyline Solana Beach Sorrento Valley Southcrest South Park Southwestern College Spring Valley Stockton Talmadge Temecula Tierrasanta Tijuana UCSD University City University Heights USD Valencia Park Valley Center Vista Warner Springs

Del Mar Mesa Preserve

This hike explores rare vernal pools

The Del Mar Mesa is a flat, chaparral-covered plateau, with an average elevation of 400 feet above sea level. Canyons drain south from the plateau into Los Peñasquitos Creek and northwest into Deer Creek, then into Carmel Valley. The flat mesa is home to numerous vernal pools. Those on land controlled by the California Department of Fish and Wildlife are currently off limits to casual visitors, but you will see some damaged pools on lands controlled by other agencies on this hike. Vernal pools have special ecology, making them worth preserving. They are homes for plants and animals that have evolved for the unique environmental conditions these pools provide, some of which cannot be found elsewhere in nature. The organisms that make their homes here must cope with standing water for at most a few months, then dry, hard sunbaked soil for the rest of the year. They live in a highly endangered habitat. At the present time, 97% of the vernal pools in Southern California have been destroyed to provide level ground for agriculture or building sites for homes, factories, or other buildings.

The canyons of the Preserve offer a most intriguing spectacle. Many contain chaparral with no evidence of past fire. Here typical chaparral species, especially scrub oak (Quercus berberidifolia), but also lemonadeberry (Rhus integrifolia), mountain mahogany (Cercocarpus betuloides) and mission manzanita (Xylococcus bicolor) have grown into small trees, with spreading canopies, creating an enchanting miniature forest you can easily walk under. Locally, the trails through these are designated tunnels and provide cooling shade on hot days. This hike will take you through Tunnel 4 and down to Deer Creek, where you may find a shallow stream.

Rocks surround a damaged vernal pool.

From the trailhead, the first half-mile of trail circumnavigates a small housing development, ironically named “The Preserve.” Instead of preserving nature, it has destroyed what was adapted to the soil and climate of the mesa to create a haven from nature. However, the developers also constructed an easily traversed gravel trail around it. As you progress around the development, you will come to trails branching off to the right that would, if you followed them, take you down through canyons to the Los Peñasquitos Preserve. Keep left. Soon after turning east and traveling away from the development on a wide dirt road, you will see a large sign ahead for the Del Mar Mesa Preserve, and just beyond it, a grove of eucalyptus trees at what may have been an old homestead site. Within 0.01 mile of the sign, the fire road splits. Take the road to the right. Shortly, you will come to a four-way intersection. The fire road continues across the mesa while the Bowtie trail splits off to the left and has a sign asking you not to enter, though hundreds of mountain bikers make regular use of this trail. On the right is another marker that simply announces ”Trail.” Continue on the trail to the right toward the eucalyptus grove, which you will reach at about 0.9 mile from the trailhead.

Trail is well marked.

Up to this point you have been traveling along the mesa top through coastal or maritime chaparral, dominated by chamise, with an intermixture of lemonadeberry, mission manzanitas, black sage, spine brush, coast prickly pear, spice bush, common fiddlenecks, and bush monkeyflower. Although the Preserve rules admonish you to stay on the designated trails, if you were to try to walk through these brushlands, you would find it very difficult due to the thick growth of stiff shrub branches, often armed with thorns that would tear at your clothes and flesh. Openings between shrubs are usually small and might contain a cryptogamic crust composed of drought-resistant moss, lichens, and other non-flowering plants, or represent depressions containing vernal pools.

The mesa chaparral rarely rises above waist or shoulder height and doesn’t prepare you for what you find when you enter the canyon chaparral, such as you’ll find on the Tunnel 4 Trail, which starts shortly beyond the eucalyptus grove. Not only has the chaparral grown to a height well over your head, but also the dominant species are scrub oak and lemonadeberry, with only a few spindly chamise and black sage. Tunnel 4 Trail continues down the canyon through this enchanting forest for nearly a mile before connecting with Deer Creek. After crossing Deer Creek, follow the trail above the creek heading west until you reach the Fire Road going south. It crosses Deer Creek again, and then proceeds up a hillside named “Cardiac Hill,” though it is neither very steep nor very difficult. Follow the Fire Road back toward the eucalyptus grove, then continue on the path around the housing development to your vehicle.

Trees shade the trail.

Driving directions: (Del Mar) From downtown San Diego, take I-5 north to Del Mar. Stay in the right lane as you approach the I-5/I-805 merge and get on the I-5 Local Bypass road. Exit the I-5 Bypass road onto Carmel Mountain Road. Follow Carmel Mountain Road east through one signal, turning right at the next. Continue on Carmel Mountain Road for about 5 miles. Its name changes to Del Vino Road after crossing a bridge where the road narrows. Continue on Del Vino until you reach Rancho Toyon Place, on your right. Proceed down Rancho Toyon Place to the trailhead, on the right, just before a gated community. Park on the public street before entering the turn around.

Hiking length: 4.5 miles, out-and-back. Allow 2.5 hours hiking time.

Difficulty: Moderate, with elevation gain 400 feet.

Here's something you might be interested in.
Submit a free classified
or view all
1 bed/1 bath, apartment in East Village, $449,000
San Diego Reader Classified ads
March 26, 2020
FREE GASLAMP WALKING TOUR
San Diego Reader Classified ads
March 24, 2020
SUBLIME EXPRESS INC.
San Diego Reader Classified ads
March 24, 2020
WILL PAY CASH....
San Diego Reader Classified ads
March 24, 2020
FREE ONLINE MATH CLASSES for kids/adults
San Diego Reader Classified ads
March 23, 2020
Ad
Previous article

Marisa Dabice: people see it as brave

Mannequin Pussy’s songs are often “short aggressive burners”
Next Article

Oversized H&M blazers make a comeback

Style influenced by Bella Hadid, Alexa Chung, Harry Styles, but mostly Mom
Comments
3

Leashed dogs permitted?

June 27, 2018

Yes, but not recommended during prime hours. This trail is very narrow and heavily traveled by mountain bikers. It might be difficult with a dog down there. However, if you're going mid-week there are far less people. Most people access this trail during weekends and after work. It is a gem you'll never forget.

June 28, 2018

I would argue that fragile and beautiful habitat of Del Mar Mesa--with the constant encroachment of development over the past three decades, and the endless new trail making by the mountain biking community (every fence put up by the California Department of Fish and Wildlife has been broken through or pushed down by mountain bikers)--is in serious danger of being destroyed. What's worse, many of the plants here are rarer and larger than those at our beloved Torrey Pines State Reserve. In a different era, perhaps there would have been the money and will to change Del Mar Mesa into a state park. It's certainly deserving of some protected status, if only to admire the 30+ foot tall scrub oaks and summer holly plants + the awesome vernal pool flowers in spring! If the United States survives in its current state for another century, given the challenges of both climate change and new immigration, I honestly wonder if any unspoiled native habit will be left.

June 28, 2018

Sign in to comment

Sign in

Del Mar Mesa Preserve—trees shade the trail
Del Mar Mesa Preserve—trees shade the trail

The Del Mar Mesa is a flat, chaparral-covered plateau, with an average elevation of 400 feet above sea level. Canyons drain south from the plateau into Los Peñasquitos Creek and northwest into Deer Creek, then into Carmel Valley. The flat mesa is home to numerous vernal pools. Those on land controlled by the California Department of Fish and Wildlife are currently off limits to casual visitors, but you will see some damaged pools on lands controlled by other agencies on this hike. Vernal pools have special ecology, making them worth preserving. They are homes for plants and animals that have evolved for the unique environmental conditions these pools provide, some of which cannot be found elsewhere in nature. The organisms that make their homes here must cope with standing water for at most a few months, then dry, hard sunbaked soil for the rest of the year. They live in a highly endangered habitat. At the present time, 97% of the vernal pools in Southern California have been destroyed to provide level ground for agriculture or building sites for homes, factories, or other buildings.

The canyons of the Preserve offer a most intriguing spectacle. Many contain chaparral with no evidence of past fire. Here typical chaparral species, especially scrub oak (Quercus berberidifolia), but also lemonadeberry (Rhus integrifolia), mountain mahogany (Cercocarpus betuloides) and mission manzanita (Xylococcus bicolor) have grown into small trees, with spreading canopies, creating an enchanting miniature forest you can easily walk under. Locally, the trails through these are designated tunnels and provide cooling shade on hot days. This hike will take you through Tunnel 4 and down to Deer Creek, where you may find a shallow stream.

Rocks surround a damaged vernal pool.

From the trailhead, the first half-mile of trail circumnavigates a small housing development, ironically named “The Preserve.” Instead of preserving nature, it has destroyed what was adapted to the soil and climate of the mesa to create a haven from nature. However, the developers also constructed an easily traversed gravel trail around it. As you progress around the development, you will come to trails branching off to the right that would, if you followed them, take you down through canyons to the Los Peñasquitos Preserve. Keep left. Soon after turning east and traveling away from the development on a wide dirt road, you will see a large sign ahead for the Del Mar Mesa Preserve, and just beyond it, a grove of eucalyptus trees at what may have been an old homestead site. Within 0.01 mile of the sign, the fire road splits. Take the road to the right. Shortly, you will come to a four-way intersection. The fire road continues across the mesa while the Bowtie trail splits off to the left and has a sign asking you not to enter, though hundreds of mountain bikers make regular use of this trail. On the right is another marker that simply announces ”Trail.” Continue on the trail to the right toward the eucalyptus grove, which you will reach at about 0.9 mile from the trailhead.

Trail is well marked.

Up to this point you have been traveling along the mesa top through coastal or maritime chaparral, dominated by chamise, with an intermixture of lemonadeberry, mission manzanitas, black sage, spine brush, coast prickly pear, spice bush, common fiddlenecks, and bush monkeyflower. Although the Preserve rules admonish you to stay on the designated trails, if you were to try to walk through these brushlands, you would find it very difficult due to the thick growth of stiff shrub branches, often armed with thorns that would tear at your clothes and flesh. Openings between shrubs are usually small and might contain a cryptogamic crust composed of drought-resistant moss, lichens, and other non-flowering plants, or represent depressions containing vernal pools.

The mesa chaparral rarely rises above waist or shoulder height and doesn’t prepare you for what you find when you enter the canyon chaparral, such as you’ll find on the Tunnel 4 Trail, which starts shortly beyond the eucalyptus grove. Not only has the chaparral grown to a height well over your head, but also the dominant species are scrub oak and lemonadeberry, with only a few spindly chamise and black sage. Tunnel 4 Trail continues down the canyon through this enchanting forest for nearly a mile before connecting with Deer Creek. After crossing Deer Creek, follow the trail above the creek heading west until you reach the Fire Road going south. It crosses Deer Creek again, and then proceeds up a hillside named “Cardiac Hill,” though it is neither very steep nor very difficult. Follow the Fire Road back toward the eucalyptus grove, then continue on the path around the housing development to your vehicle.

Trees shade the trail.

Driving directions: (Del Mar) From downtown San Diego, take I-5 north to Del Mar. Stay in the right lane as you approach the I-5/I-805 merge and get on the I-5 Local Bypass road. Exit the I-5 Bypass road onto Carmel Mountain Road. Follow Carmel Mountain Road east through one signal, turning right at the next. Continue on Carmel Mountain Road for about 5 miles. Its name changes to Del Vino Road after crossing a bridge where the road narrows. Continue on Del Vino until you reach Rancho Toyon Place, on your right. Proceed down Rancho Toyon Place to the trailhead, on the right, just before a gated community. Park on the public street before entering the turn around.

Hiking length: 4.5 miles, out-and-back. Allow 2.5 hours hiking time.

Difficulty: Moderate, with elevation gain 400 feet.

Sponsored
Here's something you might be interested in.
Submit a free classified
or view all
Mr. Peanut tumbler glass
San Diego Reader Classified ads
March 12, 2020
A MASSAGE BY KEITH MILLER
San Diego Reader Classified ads
March 24, 2020
MOVING SALE at Banker’s Hill.
San Diego Reader Classified ads
March 24, 2020
HORSEBACK,
San Diego Reader Classified ads
March 24, 2020
LA MESA HOUSE
San Diego Reader Classified ads
March 24, 2020
Previous article

Oversized H&M blazers make a comeback

Style influenced by Bella Hadid, Alexa Chung, Harry Styles, but mostly Mom
Next Article

Happy Ron Hill: drop a dollar in the e-bucket

Everyone knows someone who’s in trouble right now
Comments
3

Leashed dogs permitted?

June 27, 2018

Yes, but not recommended during prime hours. This trail is very narrow and heavily traveled by mountain bikers. It might be difficult with a dog down there. However, if you're going mid-week there are far less people. Most people access this trail during weekends and after work. It is a gem you'll never forget.

June 28, 2018

I would argue that fragile and beautiful habitat of Del Mar Mesa--with the constant encroachment of development over the past three decades, and the endless new trail making by the mountain biking community (every fence put up by the California Department of Fish and Wildlife has been broken through or pushed down by mountain bikers)--is in serious danger of being destroyed. What's worse, many of the plants here are rarer and larger than those at our beloved Torrey Pines State Reserve. In a different era, perhaps there would have been the money and will to change Del Mar Mesa into a state park. It's certainly deserving of some protected status, if only to admire the 30+ foot tall scrub oaks and summer holly plants + the awesome vernal pool flowers in spring! If the United States survives in its current state for another century, given the challenges of both climate change and new immigration, I honestly wonder if any unspoiled native habit will be left.

June 28, 2018

Sign in to comment

Sign in

Art Reviews — W.S. Di Piero's eye on exhibits Ask a Hipster — Advice you didn't know you needed Best Buys — San Diego shopping Big Screen — Movie commentary Blurt — Music's inside track Booze News — San Diego spirits City Lights — News and politics Classical Music — Immortal beauty Classifieds — Free and easy Cover Stories — Front-page features Excerpts — Literary and spiritual excerpts Famous Former Neighbors — Next-door celebs Feast! — Food & drink reviews Feature Stories — Local news & stories From the Archives — Spotlight on the past Golden Dreams — Talk of the town Here's the Deal — Chad Deal's watering holes Just Announced — The scoop on shows Letters — Our inbox [email protected] — Local movie buffs share favorites Movie Reviews — Our critics' picks and pans Musician Interviews — Up close with local artists Neighborhood News from Stringers — Hyperlocal news News Ticker — News & politics Obermeyer — San Diego politics illustrated Of Note — Concert picks Out & About — What's Happening Overheard in San Diego — Eavesdropping illustrated Poetry — The old and the new Pour Over — Grab a cup Reader Travel — Travel section built by travelers Reading — The hunt for intellectuals Roam-O-Rama — SoCal's best hiking/biking trails San Diego Beer News — Inside San Diego suds SD on the QT — Almost factual news Set 'em Up Joe — Bartenders' drink recipes Sheep and Goats — Places of worship Special Issues — The best of Sports — Athletics without gush Street Style — San Diego streets have style Suit Up — Fashion tips for dudes Theater Reviews — Local productions Theater antireviews — Narrow your search Tin Fork — Silver spoon alternative Under the Radar — Matt Potter's undercover work Unforgettable — Long-ago San Diego Unreal Estate — San Diego's priciest pads Waterfront — All things ocean Your Week — Daily event picks
4S Ranch Allied Gardens Alpine Baja Balboa Park Bankers Hill Barrio Logan Bay Ho Bay Park Black Mountain Ranch Blossom Valley Bonita Bonsall Borrego Springs Boulevard Campo Cardiff-by-the-Sea Carlsbad Carmel Mountain Carmel Valley Chollas View Chula Vista City College City Heights Clairemont College Area Coronado CSU San Marcos Cuyamaca College Del Cerro Del Mar Descanso Downtown San Diego Eastlake East Village El Cajon Emerald Hills Encanto Encinitas Escondido Fallbrook Fletcher Hills Golden Hill Grant Hill Grantville Grossmont College Guatay Harbor Island Hillcrest Imperial Beach Imperial Valley Jacumba Jamacha-Lomita Jamul Julian Kearny Mesa Kensington La Jolla Lakeside La Mesa Lemon Grove Leucadia Liberty Station Lincoln Acres Lincoln Park Linda Vista Little Italy Logan Heights Mesa College Midway District MiraCosta College Miramar Miramar College Mira Mesa Mission Beach Mission Hills Mission Valley Mountain View Mount Hope Mount Laguna National City Nestor Normal Heights North Park Oak Park Ocean Beach Oceanside Old Town Otay Mesa Pacific Beach Pala Palomar College Palomar Mountain Paradise Hills Pauma Valley Pine Valley Point Loma Point Loma Nazarene Potrero Poway Rainbow Ramona Rancho Bernardo Rancho Penasquitos Rancho San Diego Rancho Santa Fe Rolando San Carlos San Marcos San Onofre Santa Ysabel Santee San Ysidro Scripps Ranch SDSU Serra Mesa Shelltown Shelter Island Sherman Heights Skyline Solana Beach Sorrento Valley Southcrest South Park Southwestern College Spring Valley Stockton Talmadge Temecula Tierrasanta Tijuana UCSD University City University Heights USD Valencia Park Valley Center Vista Warner Springs
Close