BestRacesroad · Birr monster mash mile fun run · Birr monster mash fun run 12 years and under
BIRR Monster Mash Mile Fun Run
| Distances | Birr monster mash mile fun run, Birr monster mash fun run 12 years and under |
| Surface | road |
| USATF certified | No |
| Boston qualifier | No |
From the race's RunSignup listing, last updated July 26, 2026.
Running BIRR Monster Mash Mile Fun Run for a cause? Set up a free team page — rally your people, point donations straight to your charity.
Race-day weather
What the weather did on October 31 in each of the last 5 years, measured at Hilo International Airport, 2.8 miles from Hilo.
| Year | High | Low | Rain |
|---|---|---|---|
| 2025 | 82°F | 70°F | 0.44 in |
| 2024 | 83°F | 72°F | 1.06 in |
| 2023 | 85°F | 70°F | 0.03 in |
| 2022 | 81°F | 69°F | 1.69 in |
| 2021 | 83°F | 66°F | none |
Daily highs and lows, not start-line temperatures: most races start in the cool of the morning, closer to the low. Source: NOAA National Centers for Environmental Information, GHCN-Daily.
Stay near Hilo
Hotels and rentals in and around Hilo, HI.
Preset to race weekend, Oct 30 – Nov 1.
Bookings made through this map may earn BestRaces a commission. It has no effect on rankings (how ranking works).
Run this one?
Tell other runners it's worth the entry fee. One tap, no email, no account.
Votes don't affect the ranking. Here's what does →