Endless Day Backyard Ultra
Oct 17Richfield, UT100 mi, 50 mi +4
Also 100 miles, 97 mi from Pony Express Trail Run, registration open
8 aid stations are already loaded. Add cutoffs, pacing and the timeline your crew follows. Crew invites and race-day updates come with a Race Pass.
Build my planA 100-mile and 50-mile endurance run on the historic Pony Express Trail in western Utah, running on 100% dirt road with approximately 3,000 feet of elevation gain/loss. The course is very remote and crew support is required throughout.
Early ends
Jun 30, 2026
Registration closes
Oct 15, 2026
Race day
Oct 16, 2026
100 Miler
(after Jun 30)
$225
50 Miler
(after Jun 30)
$165
Registration openings and major changes, like a new date or a cancellation.
| Station | Distance | Crew | Drop bags | Cutoff | Supplies |
|---|---|---|---|---|---|
Government Creek Landmark along the course; Porter Rockwell had his ranch here. Not a formal aid station — crew-supported race. | 8.50 miles | -- | -- | ||
Simpson Springs Corral Timing checkpoint. Bathrooms (no running water) available. Crews cannot follow runner down the rough road to the Corral directly but can access via the main road. Also the 100-mile finish. Water may be available near the Simpson Springs bathroom near the monument. | 16.40 miles | -- | water | ||
Riverbed Station Monument off the main road at the bottom of an ancient riverbed. Not a formal aid station — crew-supported race. | 24.40 miles | -- | -- | ||
Dugway Topaz Well Timing checkpoint. Porta-potties moved here temporarily during the race. There is a shack and a silo on the southeast side of the intersection. 100-milers returning must pass through by 6:00 AM. | 33.30 miles | -- | -- | ||
Dugway Pass Timing checkpoint. No crewing allowed on the steep climb to the pass or at the top — crew must wait on the west side of the pass. | 37.50 miles | -- | -- | ||
Dugway Geode Beds Landmark/turnoff along the course. Not a formal aid station. | 40.90 miles | -- | -- | ||
Blackrock Station Timing checkpoint and 50-mile finish area. Big barbeque for runners and crews. Porta-potties available. 50-milers must finish by 12:30 AM regardless of start time. 100-milers returning must reach Blackrock by 12:30 PM. 50-milers must run an additional 0.75-mile out-and-back before finishing here. | 48.50 miles | 12:30 AM | -- | ||
Fish Springs Headquarters Timing checkpoint and 100-mile turnaround point. Public restrooms and a pay phone available. 100-milers must reach Fish Springs by 10:00 PM. Located at Fish Springs National Wildlife Refuge headquarters. | 58.20 miles | 10:00 PM | -- |
Can't race, or need an entry? Post it here so nobody has to ask if it's still available.
Oct 17Richfield, UT100 mi, 50 mi +4
Also 100 miles, 97 mi from Pony Express Trail Run, registration open
Oct 24Lake Murray State Park, OK100 mi, 100K +3
Also 100 miles, similar trail technicality to Pony Express Trail Run, registration open
Oct 17Healdsburg, CA100 mi, 50 mi +1
Also 100 miles, the same weekend as Pony Express Trail Run, registration open
Oct 17Anza, CA100 mi, 24 hr +4
Also 100 miles, similar trail technicality to Pony Express Trail Run
Straight-line distance
Oct 17Richfield, UT100 mi, 50 mi +4
Nov 7Orderville, UT150 mi, 100 mi +9
Apr 10, 2027Apple Valley, UT100 mi, 100K +3
Apr 30, 2027Wendover, UT100 mi, 100K +3
May 22, 2027Stockton, UT50 mi, 50K +1
Oct 10Tooele, UTMarathon, 23K +1
Nov 28Tooele, UT10 hr
May 15, 2027Herriman, UT12 hr, 8 hr +1
Jun 5, 2027Herriman, UT50 mi, 50K +1
Aug 28, 2027Herriman, UTMarathon, Half Marathon
May 1, 2027Herriman, UTHalf Marathon
May 1, 2027Erda, UT50 mi, 50K +2
Oct 10Herriman, UT18 mi
Nov 7Lehi, UTHalf Marathon
Jun 26, 2027Payson, UT50K, 25K
Apr 17, 2027South Jordan, UTMarathon, Half Marathon
Oct 10Syracuse, UT68K, 50K +1
Oct 10Sandy, UT5K
Oct 10Sandy, UTHalf Marathon
Oct 10Bountiful, UTHalf Marathon
Oct 17South Jordan, UT12 hr, 8 hr +1
Build your aid station plan, organize your crew, and dial in your nutrition strategy. Everything you need to finish strong.
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