-->
ultrasignup.com

Chabot/Redtail Ridge Trail Run

calendar_today 20 Feb, 2027

directions_run Running

sell $60.00 – $130.00

Chabot/Redtail Ridge Trail Run

About the Event

2027 Courses

NEW 50K & 35K COURSES! We feel these improvements will be enjoyed by all runners. We will update the course maps ASAP with approvals. Stay tuned!

Race Information

Lake Chabot Regional Park was established in the 1960s after the reservoir had been closed to recreational use for 91 years. Today, the lake remains as an emergency water supply and is open to fishers and boaters, as it is filled with trout, catfish, bass, crappie, and other fish. With eucalyptus forests, grassy meadows, lakeside paths, and hill top vistas, Lake Chabot offers over 20 miles of hiking trails, which connect to the additional 70 miles of trails in adjoining Anthony Chabot Regional Park making it a spectacular place to run and also very accessible. This is one of our typically faster races with less elevation and some paved sections. The course is designed for those who are looking to PR and those who are less competitive and/or just embarking on trail racing.

Course Information

Detailed Course Map | Turn by Turn Directions | Aid Station Distances and Cutoffs | Elevation Profiles

Aid Stations

Inside Trail Racing aid stations are replete with an optimal variety of glycogen-replenishing, electrolyte-replacing products. The following is a list of some of the foods and beverages each aid station may provide: Gu Energy gels, chews, and Stroopwafels, trail mix, pretzels, potato chips, Oreo cookies, Coke, Ginger Ale, water, Skratch Labs Sports Hydration Mix, PB&J sandwiches, M&M’s, salt tablets, bananas, watermelon, and tangerines. Aid stations are also equipped with general first aid items, including Salt-Stick tablets, but no anti-inflammatory medicine. Skratch Labs is 80 calories per serving with minimal sugar (4g per 100 ml) and a ratio of sugar (glucose + fructose) that is optimized for faster absorption, an electrolyte profile that actually matches what is lost in sweat (800 mg sodium, 80 mg potassium, 100 mg calcium, and 80 mg of magnesium per liter) As distances between aid station vary, we strongly encourage all runners to carry at least one 20oz bottle during their run.

Volunteer

Without the support of enthusiastic and caring volunteers producing our races would not be possible. Volunteers of all ages and abilities help with setup, check-in, aid stations, course marshaling, timing, and post-race food. Volunteering is a fun, novel way to experience races, play in the outdoors, and spend time with friendly people. All volunteers receive a free race T-shirt, free food, and the ability to earn credit toward a future Inside Trail Racing event, commensurate to the amount of time worked. Five hours of assisting an event results in a free race credit or Inside Trail merchandise. To volunteer for this year’s event, please submit our online volunteer form .

Shirts

Most of our race shirts are District Perfect-Tri tri-blend fabric shirt. This tee is made with top-of-the-line sportswear technology to heighten performance during your toughest workouts. With sun defense, moisture-wicking technology, quick stain release, and comfortable fit, this tri-blend performance crew serves the needs of every athlete. It’s the perfect year-round choice for outdoor sports and exercise. Get the most out of your workout with this tough, hardworking tee. Features: ● 4.5-ounce, 50/25/25 poly/combed ring spun cotton/rayon, 32 singles ● 1X1 rib knit neck ● Shoulder to shoulder taping ● UPF 30 To be guaranteed a shirt and shirt size, you must register by February 6, 2027.

Awards

The top three overall winners (male and female) of each race distance will receive a custom trophy with the race logo. In addition, the top finisher for each distance (male and female) will receive a special item from one of Inside Trail’s sponsors. All finishers will receive a custom medal with the race logo. All 50K finishers will receive a pint glass with the race logo. The Dead Last Finisher (DLF) in each even will receive a custom award. Age-group medals (3 deep) will be awarded in the following categories, for males, females and non-binary: ● 13 and under ● 14 – 19 ● 20 – 29 ● 30 – 39 ● 40 – 49 ● 50 – 59 ● 60 – 69 ● 70 and over

The Fine Print

ITR Refund Policy: Entry fees to our trail runs are non-refundable in all cases, and we do not offer credits, transfers, or deferrals to future races except as described below. Only registered runners can participate in our races, and you cannot exchange your entry with anyone else in any case. We are happy to issue a credit worth 50% of your original race fee toward a future Inside Trail Racing event if we receive your cancellation at least 3 weeks prior to the race. Credits will expire 1 year after the date issued. There will be no credit provided if a cancellation is made within 3 weeks of the race. While we understand that last-minute injuries, conflicts, emergencies, deaths, and other unfortunate events affecting registered runners can happen and may impact your plans for participation, we must adhere to our cancellation policy stated above and cannot offer any credits, refunds, transfers, or deferrals in any of these cases. If the situation does arise where ITR must outright cancel an event for any reason, there will be no refunds. This could include earthquakes, floods, extreme weather, unsafe air quality, pandemics, or any other “Act of God”. ITR at its sole discretion may choose to offer future race credit or deferrals in these force majeure situations, depending on the circumstances and how close to the race date the event was cancelled. We will communicate with all registered runners as soon as possible regarding the cancellation and any pertinent information. We do not cancel races due to rain or heat. Due to trail work, closures, or for myriad other reasons, permitting agencies may require changes to the publicized courses at any time prior to an event. This is out of our control, and we therefore will not offer refunds, credits, deferrals, or transfers (except as described below) in such a situation. If a race location is changed, but still hosted on the same day, we will automatically transfer the registration over to the new venue, or entrants may choose to run the race remotely and we will mail awards. If a race is postponed all entrants will be transferred to the new date. www.insidetrail.com

Races Offered

35K

Feb 20, 2027

straighten

Distance — 35K

terrain

Type — Running

timer

08:30

sell

$105.00

50K

Feb 20, 2027

straighten

Distance — 50K

terrain

Type — Running

timer

08:30

sell

$130.00

5K

Feb 20, 2027

straighten

Distance — 5K

terrain

Type — Running

timer

08:30

sell

$60.00

1/2 Marathon

Feb 20, 2027

straighten

Distance — 21.1K

terrain

Type — Running

timer

08:45

sell

$90.00

10K

Feb 20, 2027

straighten

Distance — 10K

terrain

Type — Running

timer

09:00

sell

$60.00

10K

Feb 20, 2027

straighten

Distance — 10K

terrain

Type — Running

timer

09:00

sell

$75.00

Weather History

These values represent the 3-year monthly averages for February in Castro Valley.

thermostat Temperature
5.9° / 13.8°
wb_sunny Feels like
3.1° / 11.2°
light_mode Avg sunshine hours
7h 39m
water_drop Avg rainfall
5.8 mm
ac_unit Avg snowfall
air Avg wind speed
9.9 km/h (Light breeze)
opacity Sweat loss rate
Low
terrain Course conditions
Firm and slightly soft
sunny Max UV Index
Moderate (3.0)
humidity_mid Humidity
80.8%
wb_twilight Sunrise
07:57
nightlight Sunset
18:46

About Castro Valley

Learn more about the host city, Castro Valley.

Scenic view of

Castro Valley is a census-designated place (CDP) in Alameda County, California, United States. At the 2020 census, it was the fourth most populous unincorporated area in California. The population was 66,441 at the 2020 census.

Read more launch

Hotels & Places to Stay

Race Results

All-time top performances and historical records for Chabot/Redtail Ridge Trail Run.

Place Name Year Time
🥇 Drew Macomber '18 3:32:51
🥈 Chris Vizcaino '16 3:42:31
🥉 Matthew Deyo '20 3:44:00
4 Bob Shebest '14 3:44:17
5 Phil Shaw '12 3:45:15

Runner Reviews

Read what other athletes have to say about their experience at the Chabot/Redtail Ridge Trail Run.

No reviews yet

Be the first to share your experience with the community!

Suggest an edit

Spotted an error or missing detail about the Chabot/Redtail Ridge Trail Run? Help us improve.

Nearby Races

Explore other exciting events happening in this same region.

BEST OF THE BAY Double Century

BEST OF THE BAY Double Century

location_on Castro Valley, California, US

calendar_today Oct 03, 2026

Dick Collins Firetrails

Dick Collins Firetrails

location_on Castro Valley, California, US

calendar_today Sep 26, 2026

10K On The Bay

10K On The Bay

location_on Hayward, California, US

calendar_today Sep 27, 2026

21st Annual Garin Park XC Challenge

21st Annual Garin Park XC Challenge

location_on Hayward, California, US

calendar_today Oct 03, 2026

Recommended for You

Hand-picked events we think you’ll love.

Kennedy Drive 8K

Nov 08, 2026

Kennedy Drive 8K

Out and back course with start/finish near the Polo Fields in Golden Gate Park. Gradual uphill on the way out and gradu…

Read more
2026 SKECHERS Wicked Wine Run Napa Valley Fall Date

Oct 10, 2026

2026 SKECHERS Wicked Wine Run Napa Valley Fall Date

Whether you’re a seasoned runner or just love to walk and take in the scenery, SKECHERS Wicked Wine Run is for you! Eac…

Read more
2026 SKECHERS Wicked Wine Run Sacramento FALL DATE

Oct 03, 2026

2026 SKECHERS Wicked Wine Run Sacramento FALL DATE

Whether you’re a seasoned runner or just love to walk and take in the scenery, SKECHERS Wicked Wine Run is for you! Eac…

Read more
TRI for Real Triathlon #1

Jun 05, 2027

TRI for Real Triathlon #1

Tri for Real Triathlon #1 Tri for Real Triathlon Series is back in 2027 on June 5th, July 10th, and August 7th. Back th…

Read more

Get race deals & updates

Subscribe to our newsletter for curated race picks and discounts.