Colorado · 100K · 50 Mile · 50K
The Bear Chase
The Bear Chase is a 100K, 50 Mile, 50K, half marathon and 10K event held in Lakewood, Colorado. It was last held on October 3, 2026 and is usually run in October; the next date hasn't been announced yet. About 89 runners take part across all distances.
- Usually held
- October
- Location
- Lakewood, CO
- Field size
- ~89 runners
Race details
- Last held
- October 3, 2026
- Usually held in
- October
- Location
- Lakewood, Colorado
- Distances
- 100K, 50 Mile, 50K, Half Marathon, 10K, 5K
- Field size
- About 89 runners
- Course
- 100K: ~4,336 ft total gain, max elevation ~5,798 ft (organizer figure); other distances scale down with fewer loops
- Registration
- aravaiparunning.com
- Official website
- bearchaserace.com
Registration, course & weather
- Registration status
- Registration status as last checked September 28, 2026: open
- Entry fee
- Listed fee for the longest distance, $210 (from aravaiparunning.com, checked September 28, 2026)
- Start time
- 5:30 AM MDT
- Course profile — 100K
- Loop course; Mostly trail, some road; 4336 ft gain (official course data); Not USATF certified
- Course profile — 50 Mile
- Loop course; Mostly trail, some road; 3694 ft gain, 3694 ft loss (official course data); Not USATF certified
- Course profile — 50K
- Loop course; Mostly trail, some road; 2211 ft gain, 2211 ft loss (official course data); Not USATF certified
- Course profile — Half Marathon
- Loop course; Mostly trail, some road; 958 ft gain, 958 ft loss (official course data); Not USATF certified
- Course profile — 10K
- Loop course; Mostly trail, some road; 361 ft gain, 361 ft loss (official course data); Not USATF certified
- Course profile — 5K
- Loop course; Mostly trail, some road; 164 ft gain, 164 ft loss (official course data); Not USATF certified
- Typical race-day weather
- about 46°F at the start, 75% humidity, 2 mph wind (based on the 2025 race day, measured near the city center rather than the exact start line; Open-Meteo, checked September 28, 2026)
About the The Bear Chase
The Bear Chase Race Endurance Festival is a trail-running weekend at Bear Creek Lake Park in Lakewood, CO, built from laps of the same singletrack loop. Saturday features the 100K, 50 Mile and 50K; Sunday adds a Half Marathon, 10K and 5K. It is considered fast and approachable by ultra standards, popular with first-time ultramarathoners.
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Guides from the RaceRove blog
- 8 min read How to Choose the Best Half Marathon for a PR, Racecation or 50-State Challenge The best half marathon depends on what you want from it. How to choose a course for a personal record, a race worth travelling for, or an efficient stop on a 50-state challenge.
- 7 min read How to Find a 5K, 10K, Half Marathon or Marathon Near You A practical way to find running races near you: pick a distance, decide how far you'll travel, read the listing properly and confirm the details before you register.
- 9 min read How to Run a Race in All 50 States How to plan a 50-state running challenge: set your own rules, group states into trips, build a calendar around the seasons, budget for it and keep track of every finish.
- Blog All guides Planning advice for finding, choosing and travelling to races.
The Bear Chase: common questions
- When is the The Bear Chase?
- The next date hasn't been announced in the listing yet. The race is usually held in October. Check the organiser's website for the official date.
- Where is the The Bear Chase held?
- In Lakewood, Colorado.
- What distances does the The Bear Chase offer?
- 100K, 50 Mile, 50K, Half Marathon, 10K and 5K.
- How many people run the The Bear Chase?
- About 89 runners across all of its distances. That figure is an estimate of the field size, not an entry cap.
- How do I register for the The Bear Chase?
- Registration is handled by the organiser at aravaiparunning.com. Entry fees, caps and deadlines are set there.
- Is registration open for the The Bear Chase?
- Registration status as last checked September 28, 2026: open. Listed fee for the longest distance, $210 (from aravaiparunning.com, checked September 28, 2026).
- What time does the The Bear Chase start?
- 5:30 AM MDT.
- What is race-day weather usually like at the The Bear Chase?
- about 46°F at the start, 75% humidity, 2 mph wind (based on the 2025 race day, measured near the city center rather than the exact start line; Open-Meteo, checked September 28, 2026).
Plan this race in RaceRove
Save it to your plan, compare it with other races, check typical race-day weather and track your 50-state progress in the interactive app.