The Rocky Ridge Half Marathon 2026 in San Ramon, California on September 19th is an event that demands respect from seasoned runners and newcomers alike. The race starts at the historic Mission Trail Regional Park, located just off of Stoneridge Drive near the town center. Known for its challenging terrain, this half marathon promises a test unlike any other. Race morning in San Ramon sees a crisp September chill with temperatures ranging from 14°C to 27°C. The sky is typically clear and sunny, offering ample sunshine that contrasts against the dense greenery of Mission Trail Regional Park. The atmosphere on race day is one of anticipation; runners gather at the starting line, ready for what lies ahead. Since its inception in 2015, the Rocky Ridge Half Marathon has grown into a local institution, attracting over 300 participants each year who come to experience the rugged beauty and challenging course. All proceeds support the San Ramon Community Foundation’s scholarship programs aimed at encouraging young athletes from diverse backgrounds. The race offers three distinct distances: the half marathon for those looking for an intense challenge; the 10K, which provides a more manageable yet still demanding route through the park's hills and trails; and the 5K for runners seeking to start their day with ease.
International Remote Runner Start: 08:00:00 • Fee: $76.98
Remote Runner Start: 08:00:00 • Fee: $50.29
Course venues vary depending on your chosen distance but all feature hard and dry surfaces suitable for running shoes. The half marathon course includes steep ascents and descents, offering views of the surrounding landscape that are rarely seen by those not participating in such events. Both 10K and 5K runners encounter similar terrain with their own unique challenges. On race day, expect a light breeze with an average wind speed of around 8.7 km/h, which can make running feel slightly more effortful but does little to dampen the spirit. Humidity levels are moderate at 70%, ensuring neither heat nor cold will hinder performance significantly. Precipitation is rare; however, it's always wise to check for any last-minute updates on trail conditions. The registration fee for the half marathon stands at $103.66, with options available for shorter distances like the 10K and 5K priced at $79.11 and $69.50 respectively. International runners can participate through a remote runner option costing $76.98. Bibs are available for pickup on September 18th from 2 to 7 PM, located at the San Ramon Community Center. Bring along any necessary identification documents as age requirements apply but no specific restrictions were mentioned in the data provided. The start line is situated just outside Mission Trail Regional Park's main entrance off Stoneridge Drive. First-time participants are encouraged to arrive early for a pre-race briefing and warm-up session. There’s nothing quite like facing such natural challenges while supporting local scholarships; it truly makes this event one not to be missed in San Ramon, California on September 19th, 2026.
Races Offered
10K
Sep 19, 2026
straighten
Distance —
10km
terrain
Type —
Others,
Running
timer
08:00
sell
$79.11
5K
Sep 19, 2026
straighten
Distance —
5km
terrain
Type —
Others,
Running
timer
08:00
sell
$69.50
Half Marathon
Sep 19, 2026
straighten
Distance —
21km
terrain
Type —
Others,
Running
timer
08:00
sell
$103.66
Weather History
These values represent the 3-year monthly averages for September in San Ramon.
thermostatTemperature
14.2° / 27.6°
wb_sunnyFeels like
13.7° / 26.0°
light_mode
Avg sunshine hours
10h 44m
water_drop
Avg rainfall
0.2 mm
ac_unit
Avg snowfall
—
air
Avg wind speed
8.7 km/h (Light breeze)
opacity
Sweat loss rate
High
terrain
Course conditions
Hard and dry surface
sunny
Max UV Index
Moderate (5.0)
humidity_mid
Humidity
70.3%
wb_twilight
Sunrise
06:50
nightlight
Sunset
19:14
About San Ramon
Learn more about the host city, San Ramon.
San Ramon is in the southwest part of Contra Costa County in the Bay Area of California.
