Distance
100 mile 100K 50 mile 50K Trail marathon Trail half Marathon Half marathon
Month
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Region
Rocky Mountains Pacific Northwest Sierra Nevada Southwest Northeast Southeast Midwest
State
Colorado Washington Vermont California Maine
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Course filters Terrain
mountain alpine forest desert rocky rooty muddy technical runnable exposed singletrack slickrock sand flat rolling fire road river crossings
Course shape
Point-to-point Loop Multi-loop Out-and-back Mixed
Race characteristics These come from what runners write about each race, not from an objective score. Each match shows how many experiences back it up.
Good first ultra Very technical Highly runnable Major climbing challenge High-altitude race Low-altitude mountain race Crew friendly Destination race Strong atmosphere Competitive Old-school Remote Scenic
Race vibe How runners describe the feel of the weekend, taken from reports and reviews. Not something the race claims about itself.
Grassroots Big production Town takeover Party finish Quiet and wild Shared sufferfest Family friendly Welcoming to first-timers Serious and competitive Trail family reunion
Crew access How practical the race is to crew: course shape, what the driving is like and how long your runner is out of reach.
Easy for crews Moderate for crews Difficult for crews Almost no crew access