At BOLDERBoulder, we get 10 rolling kilometers at more than 1,600 m, a massive wave start, neighborhood noise, and a Folsom Field finish. Early registration is open now; the $75 entry is still an estimate. This is the easy Colorado racecation pick for partners because the morning behaves like a city event, not a remote expedition. The catch is congestion: honest pace seeding matters if we want room to run.
Better info coming — we're still verifying 4 fields on this race.
Why we'd pick it
- The 100 m climbing estimate is useful for planning, not a verified pacing number.
- Open · Direct entry — no lottery to lose.
- A non-racing partner gets a real weekend here — 5/5.
- Race day usually sits 8.7–23.2°C, about 38% chance of rain.
The course
The 10 km route starts near 30th and Walnut, works through north Boulder neighborhoods, and finishes inside the University of Colorado's Folsom Field. It is rolling rather than flat and sits above 1,600 m throughout. The huge wave start makes pace placement matter, while Memorial Day sun can build before later runners reach the stadium.
Difficulty and PR scores
Difficulty is the course and the conditions. The PR score is a separate read on a fast clock. Missing inputs are dropped and the other weights are rescaled. The method, with the weights.
- Difficulty
- 55 / 100
- PR / BQ friendliness
- Not scored
Weight used: 60%. Need 40% before we print a number.
Weight used: 30%. Need 45% before we print a number.
Weather median for 2011–2025, race date ±7 days, 225 days, at Start, 30th and Walnut. Grid elevation 1608 m.
No cited BQ rate for this race.
| Input | 0–100 | What went in |
|---|---|---|
| G Gain | — | No trusted gain per km. Uncertain stored gain is not used. |
| A Altitude | 76.9 | 1608 m. 0 below 300 m, 100 at 2000 m. Source: open-meteo-grid. |
| H Heat | 75 | High 23.2°C, dew point 6.8°C. The hotter of the two bands is used. |
| W Wind | 15 | 1.95 m/s median. Bands: under 3 → 15, under 5 → 40, under 8 → 70, else 100. |
| S Surface | 15 | road. Road 15, mixed 45, gravel 70, trail 90. |
| T Cool temps | 25 | 100 minus heat (75). |
| B BQ evidence | — | No cited BQ rate. |
Stays around the race
These are area searches near the published start, finish, and course pins. TripRace may earn a commission if you book, at no extra cost to you. We are not naming a hotel.
- Near the start — Race start
- Near the finish — Folsom Field finish
