Bay Area Trail Races 2026–2027: Calendar & Registration

Q: How do I register for a trail race?

Use the Register link to visit the active registration page. The organizer handles registration, payment, waivers, transfers, cancellations, and refunds.

Q: How current is this Bay Area trail race calendar?

Dates are checked against official race organizers and registration platforms. Every listing shows its source and verification date.

28 races

October 2026

DateRace / locationDistanceDifficultySourceActions

SatOct 10

Reservoir Dogs

San Pablo Reservoir · Orinda

5K not published · 10K 500′ · Half 1,450′ · 35K 2,800′

5K · 10K · Half · 35K

Moderate

Inside TrailVerified Aug 30Registration open

SatOct 17

Diablo Summit Stomp

Castle Rock Recreation Area · Walnut Creek

5K 558′ · 10K 1,249′ · Half/30K profiles linked by organizer

5K · 10K · Half · 30K

Very hard

Brazen RacingVerified Sep 25Registration open

SatOct 24

Oakland Hills

Redwood Regional Park · Oakland

10K 1,250′ · Half 2,900′ · 35K 4,550′

10K · Half · 35K

Hard

Inside TrailVerified Aug 30

SatOct 24

Napa Fall Wine Country

Bothe-Napa Valley State Park · Calistoga

5K profile linked; gain not stated · 10K 925′ · Half 1,944′ · Marathon 3,944′

5K · 10K · Half · Marathon

Moderate

Enviro-SportsVerified Aug 30Registration open

November 2026

DateRace / locationDistanceDifficultySourceActions

SatNov 7

Mt. Tam Trail Run

Mt. Tamalpais State Park · Stinson Beach

10K 1,600′ · Half 2,800′ · 30K 3,900′ · 50K 6,000′

10K · Half · 30K · 50K

Very hard

Inside TrailVerified Aug 30Sold out

Race details

SatNov 7

Mermaid Trail Run

Huddart Park · Woodside

Hilly trails; see organizer course maps

3M · 6M · 9M · Half · 6-hour individual/relay

Hard

Mermaid SeriesVerified Sep 13Registration open

RegisterWe may earn a small commission.

ThuNov 26

Nitro Turkey

Point Pinole Regional Park · San Pablo

5K fire trails · 10K includes ~½ mile paved

5K · 10K

—

Brazen RacingVerified Sep 28Registration open

December 2026

DateRace / locationDistanceDifficultySourceActions

SatDec 5

Peacock Gap Trail Run

China Camp State Park · San Rafael

10K 1,140′ · Half 1,800′ · 30K 2,735′

10K · Half · 30K

Hard

Inside TrailVerified Aug 30Registration open

SatDec 5

Calero Trail Run

Calero County Park · San Jose

5K 252′ · 10K 1,187′ · 15K 1,751′ · Half 2,477′ · 25K 2,726′ · Marathon/50K not published

5K · 10K · 15K · Half · 25K · Marathon · 50K

Moderate

Troy's California Trail RunsVerified Aug 30Registration open

SunDec 6

Krampus Cross Country

Presidio Ecology Trail · San Francisco

Course maps linked; elevation gain not published by organizer

5K · 10K · 9M

Moderate

Sasquatch RacingVerified Sep 25Registration open

SatDec 12

Hark the Herald Angels

Angel Island State Park · Tiburon

Elevation by distance not published by organizer

10K · Half

Moderate

Enviro-SportsVerified Aug 30Registration open

SatDec 12

Summit Rock

Sanborn County Park · Saratoga

Half 2,867′ · 5K/10K profiles linked by organizer

5K · 10K · Half

Hard

Brazen RacingVerified Sep 25Registration open

SatDec 19

Woodside Ramble

Huddart County Park · Woodside

10K 1,100′ · Half 2,600′ · 35K 3,600′ · 50K 5,400′

10K · Half · 35K · 50K

Hard

Inside TrailVerified Aug 30

January 2027

DateRace / locationDistanceDifficultySourceActions

SatJan 2

Hacienda Hills Winter

Almaden Quicksilver County Park · San Jose

Course maps available

1M · 5K · 10K · 9M · Half · 30K · Marathon · 50K

—

Troy's California Trail RunsVerified Sep 28Registration open

SatJan 23

Pacifica Foothills

San Pedro Valley Park · Pacifica

10K 1,200′ · Half 3,100′ · 30K 4,300′

10K · Half · 30K

Very hard

Inside TrailVerified Aug 30

SatJan 30

Coyote Hills

Coyote Hills Regional Park · Fremont

5K 107′ · 10K 184′ · Half 678′

5K · 10K · Half

Easy

Brazen RacingVerified Aug 30Registration open

February 2027

DateRace / locationDistanceDifficultySourceActions

SatFeb 6–7

Fort Ord Trail Run

Fort Ord National Monument · Monterey

10K 900′ · 25K 2,250′ · 50K 4,300′Feb 6: 50K · Feb 7: 10K, 25K

10K · 25K · 50K

Moderate

Inside TrailVerified Sep 25

SatFeb 6

Monterey Ultra 50 Miler

Fort Ord National Monument · Monterey

50.7M 7,080′

50.7M

Very hard

Inside TrailVerified Sep 25Registration open

SatFeb 20

Chabot / Redtail Ridge

Lake Chabot Regional Park · Castro Valley

5K 110′ · 10K 650′ · Half 1,800′ · 30K 2,800′ · 50K 4,500′

5K · 10K · Half · 30K · 50K

Hard

Inside TrailVerified Aug 30

March 2027

DateRace / locationDistanceDifficultySourceActions

SatMar 13

Marin Ultra Challenge

Rodeo Beach · Sausalito

50K ~6,000′ · 50M 10,550′

50K · 50M

Very hard

Inside TrailVerified Aug 30

SatMar 20

Napa Valley Trail Run

Bothe-Napa Valley State Park · Calistoga

5K profile linked; gain not stated · 10K 925′ · Half 1,944′ · Marathon 3,944′

5K · 10K · Half · Marathon

Moderate

Enviro-SportsVerified Aug 30Registration open

RegisterWe may earn a small commission.

SatMar 27

Western Pacific

Quarry Lakes · Fremont

5K ~68′ · 10K ~94′ · Half ~227′

5K · 10K · Half

Easy

Brazen RacingVerified Aug 30Registration open

April 2027

DateRace / locationDistanceDifficultySourceActions

SatApr 3

Golden Gate Headlands

Marin Headlands · Sausalito

10K gain not stated · Half ~2,183′ · Marathon ~4,367′

10K · Half · Marathon

Hard

Enviro-SportsVerified Aug 30Registration open

RegisterWe may earn a small commission.

SatApr 3

Diablo Trails Challenge

Castle Rock Recreation Area · Walnut Creek

5K ~280′ · 10K ~910′ · Half ~2,400′ · 50K ~7,010′

5K · 10K · Half · 50K

Very hard

Save Mount DiabloVerified Aug 30Registration open

SatApr 10

Romancing the Island

Angel Island State Park · Tiburon

Elevation by distance not published by organizer

10K · Half

Moderate

Enviro-SportsVerified Aug 30Registration open

RegisterWe may earn a small commission.

SatApr 17

Call of the Wild

Jack London State Historic Park · Glen Ellen

5K gain not published · 5.5M 780′ · Half 1,854′

5K · 5.5M · Half

Moderate

Enviro-SportsVerified Sep 25Registration open

SatApr 24

Mt. Tam Wild Boar

Mt. Tamalpais State Park · Mill Valley

10K 885′ · Half ~2,730′

10K · Half

Very hard

Enviro-SportsVerified Aug 30Registration open

RegisterWe may earn a small commission.

May 2027

DateRace / locationDistanceDifficultySourceActions

SatMay 8

Stinson Beach / Muir Woods

Stinson Beach Park · Stinson Beach

7M ~2,187′ · Half ~4,790′ · Marathon ~8,330′

7M · Half · Marathon

Very hard

Enviro-SportsVerified Aug 30Registration open

Bay Area trail race guide

What trail races are coming up near San Francisco?

There are 28 confirmed trail races from October 2026 through May 2027 across San Francisco, Marin, the East Bay, Peninsula, South Bay, Napa, North Bay, and Monterey.

Which upcoming Bay Area trail races offer a 10K or shorter distance?

Choose “Up to 10K” to find shorter options including Reservoir Dogs, Diablo Summit Stomp, Krampus Cross Country, Peacock Gap, and several Enviro-Sports races.

Which Bay Area trail races have the most elevation gain?

Choose “Very hard” for races with the largest climbs, including Diablo Summit Stomp, Mt. Tam Trail Run, Monterey Ultra, Marin Ultra Challenge, and Stinson Beach / Muir Woods. Open each race guide for known elevation details.

Where can I find trail half marathons near San Francisco?

Choose “10K–Half” to compare trail half marathons throughout Marin, the East Bay, Peninsula, South Bay, Napa, and Monterey. Each listing links to an active registration page when registration is open.

How do I register for a trail race?

Registration and payment are handled by the race organizer.

How current is this trail race calendar?

Dates come from official race organizers and registration platforms. Every listing shows its source and verification date.

Find a Trail Race

Better weekends outside.

The Bay Area is our first regional calendar. More trail-running regions are coming next.