Frost or Fog 10-Mile, 1/4 Marathon & 5K
About this race
The Frost or Fog 10-Mile, Quarter Marathon and 5K is one of Chico’s favorite winter runs! Run in Upper Bidwell Park for great,
challenging courses that cover gravel, trail and road or run wherever you are!
Pre-race coffee will be provided by Bidwell Perk.
Pick your distance
Running
Standard 10-Mile
The 10ish-Mile course follows the 1/4 Marathon route but continues past Bear Hole for approximately 1.75 miles before you turn around to join your friends on the way back! This year the turnaround will be where B-trail meets Upper Park Road due to the damage from the Park Fire
Standard 1/4 Marathon
The 1/4 Marathon (6.55 miles) course is the same as the 5K course until the Shooting Range. 1/4 Marathon runners will pass the Shooting Range and continue back to Bear Hole. Runners turn around at Bear Hole and will come back along the road, pass the Shooting Range, and turn left on 5 Mile Way. Runners will finish at the far end of the footbridge.
Standard 5K
The 5K course begins at 5 Mile on the levee and continues onto Wildwood Trail to the Shooting Range. Runners/walkers will turn around at the Shooting Range and come back along the bike path turning left onto 5 Mile Way. Runners/walkers will finish at the far end of the footbridge.
Typical race-day weather
Based on 14 years of Open-Meteo archive data for this event's race dates in Chico, plus the 3 days either side.
The sun rises at 7:25 AM and sets at 5:08 PM local time (PST) in Chico on January 16, 2027 — 9h 42m of daylight.
Course
No course map published yet.
The organizer hasn't released a route for this event, and we don't publish guesses. If you're the organizer, send us a GPX file and we'll draw the profile.
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Results — Frost or Fog 10-Mile, 1/4 Marathon & 5K
Other races near Chico
Different organizers, within 40 miles, in the next three months
Free New Year's Day 5k by Chico Running Club
Phoenix 5k/10k
G.o.l.o.w. Turkey Trot
Run Colusa
🏃 Plan Your Next Race in Chico
Find upcoming events by distance:
- Chico 5K Races 7 races
- 10K Run Events in Chico 3 races
- Chico Running Calendar 2026 10 races
Where this page comes from. Race details were last updated on . We re-check listings regularly and again in the week before race day.
- Entries, prices, waves and inclusions — the event's official registration page
- Temperature and humidity — Copernicus ERA5 reanalysis via Open-Meteo (CC BY 4.0)
- Elevation and terrain relief — Copernicus DEM GLO-90, ESA (CC BY 4.0)
- Comparisons and counts — Race Discovery calendar, 13 Chico events
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