- Weather
- 49°Ftypical start
- Field size
- ~400 runners
- Course
- Flat
- Elevation
- 150 ft gain · 0 ft net
Event: Full Marathon Slow Racers - Over 6 Hrs 30 Min to finish
PR9.1Weather9.1Experience6.0
All marathons
Early May · Mountain West · Out-and-Back
Boise River Marathon
Boise, ID
Event listed as: Marathon
- Best for PR
- Boston Qualifier
Registration opens on the organizer's site
- Typical start temp
- 49°F(estimated)
- Field size
- ~500 runners(estimated)
- Course
- Flat
- Elevation
- 150 ft gain · 0 ft net(estimated)
Why runners choose this race
A out-and-back course around Boise, ID, with very little meaningful elevation change.
Good fit if
- · PR attempts
- · Boston qualification
- · Runners who want a low-key start
Think twice if
- · You want crowds and on-course energy
Course and logistics
- Course type
- Out-and-Back
- Surface
- Road
- Total gain
- 150 ft(estimated)
- Total loss
- 150 ft(estimated)
- Net elevation
- 0 ft(estimated)
- Field size
- ~500 runners(estimated)
- Crowd support
- Quiet, low-key
- Entry
- Easy
- Entry fee
- $60(most recent listed price)
- Day of week
- Sunday
- Start / finish
- Start and finish in the same area
Race details
- Typical timing
- Early May
- Next confirmed date
- Sunday, May 2, 2027
- Registration
- Open now
- Region
- Mountain West
- Editorial tier
- Recommended
- Prestige
- 5.0/10(estimated)
- Data last reviewed
- 2026-08-26
Event listed as: Marathon
Good to know
- Best for PR
- Boston Qualifier
- Out-and-back
- Flat course
- Easy entry
Race-day weather
Modelled from location, month and coastal proximity — not verified race history.
ExcellentGoodWarmHeat risk
Typical start sits at 49°F — excellent marathon conditions.
Similar races
- Weather
- 45°Ftypical start
- Field size
- ~1,000 runners
- Course
- Flat
- Elevation
- 200 ft gain
Flat course along Boise River Greenbelt
PR9.4Weather9.2Experience7.2
- Weather
- 50°Ftypical start
- Field size
- ~600 runners
- Course
- Flat
- Elevation
- 50 ft gain · 0 ft net
Event listed as: Marathon
PR9.1Weather9.0Experience6.2