City of Trees Marathon
Oct 11Boise, IDMarathon, Half Marathon +2
Also a marathon, 1 mi from Idaho Running Day, registration open
Aid stations, cutoffs and pacing in one plan, with the timeline your crew follows. Crew invites and race-day updates come with a Race Pass.
Build my planIdaho Running Day (taking place on October 17th, 2026) is a great event for all athletes with a 5k, 10k, Half Marathon, and Marathon distances. Starting at Lucking Peak State park and moving through Southeast Boise, this race showcases our Boise River Greenbelt!
Parking at Lucky Peak State Park and Sandy Point Recreation area is VERY LIMITED.
Please visit the "PARKING" section on our website for more details and parking options.
Boise Running Website Linked Here
Start Times:
MARATHON AND HALF MARATHON START TIME 8:00AM
5K AND 10K START TIME 9:00AM
Packet Pickup Options:
Please visit the "PACKET PICKUP" section on our website for details
Boise Running Website Linked Here
All participants receive:
Medals designed locally by our race team
High-quality athletic shirts
Post-Race Party
Real-Time Chip Results
DISTANCES:
5K: Course Map PDF | Interactive Course Map
10K: Course Map PDF | Interactive Course Map
Half Marathon: Course Map PDF | Interactive Course Map
Marathon: Course Map PDF | Interactive Course Map
Registration opens
Oct 31, 2025
Tier 1 ends
Jan 1, 2026
Tier 2 ends
Apr 1, 2026
Tier 3 ends
May 1, 2026
Tier 4 ends
Jun 1, 2026
Tier 5 ends
Jul 1, 2026
Tier 6 ends
Aug 1, 2026
Tier 7 ends
Sep 1, 2026
Tier 8 ends
Oct 1, 2026
Registration closes
Oct 17, 2026
Race day
Oct 17, 2026
Tier 9 ends
Oct 17, 2026
Marathon
Tier 9, until Oct 17, 2026
$125
Half Marathon
Tier 9, until Oct 17, 2026
$115
10K
Tier 9, until Oct 17, 2026
$75
5K
Tier 9, until Oct 17, 2026
$55
Registration openings and major changes, like a new date or a cancellation.
Can't race, or need an entry? Post it here so nobody has to ask if it's still available.
Oct 11Boise, IDMarathon, Half Marathon +2
Also a marathon, 1 mi from Idaho Running Day, registration open
Oct 17Healdsburg, CA100 mi, 50 mi +1
Also a marathon, the same weekend as Idaho Running Day, registration open
Oct 17Julian, CA50K, Marathon +1
Also a marathon, the same weekend as Idaho Running Day, registration open
Oct 11Spokane, WAMarathon, Half Marathon +2
Also a marathon, 1 week before Idaho Running Day, registration open
Straight-line distance
Oct 10Hayden Lake, IDMarathon, Half Marathon +2
Oct 11Boise, IDMarathon, Half Marathon +2
Oct 17Boise, ID5K
Oct 24Boise, IDHalf Marathon, 5K +1
Nov 14Boise, IDHalf Marathon
Nov 20Meridian, IDBackyard Ultra
Nov 21Meridian, IDRun
Oct 10Cambridge, ID9 mi, 6 mi +1
Oct 10Cambridge, IDHalf Marathon, 10K +1
Oct 31McCall, ID
Oct 10McCall, ID50K, 30K +1
Jul 24, 2027Ketchum, ID100 mi, 60K +1
Jun 19, 2027Challis, ID108K, 55K +1
Build your aid station plan, organize your crew, and dial in your nutrition strategy. Everything you need to finish strong.
Build my planAre you the race director for Idaho Running Day?
Claim this race to manage registration, volunteers, and race day.