BIRR Monster Mash Mile Fun Run 2026
- Date
- Saturday, October 31, 2026
- Start time
- 9:00 AM start (Honolulu)
- Location
- Hilo, Hawaii
- Entry fee
- From Free
Registration is open.
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Events and entry fees
| Event | Distance | When | Entry fee | Cap |
|---|---|---|---|---|
| BIRR Monster Mash Fun Run - 12 years and under. | Kids | Oct 31, 20269:00 AM | Free | – |
| BIRR Monster Mash Mile Fun Run | Kids | Oct 31, 20269:00 AM | $10 | – |
Entry fees exclude processing fees. Prices and dates come from the race's registration page and refresh nightly.
Race day planning
Entry fee schedule
- BIRR Monster Mash Fun Run - 12 years and under.: Free until Oct 29.
- BIRR Monster Mash Mile Fun Run: $10 until Oct 29.
Online registration closes Oct 29, 2026, unless the race fills first.
Light and altitude
Sunrise on race morning is at about 6:21 AM, and the BIRR Monster Mash Fun Run - 12 years and under. starts at 9:00 AM. The start sits about 2,680 feet above sea level.
Fees exclude processing fees. Comparisons use current entry fees and published results from races nearby.
Start location and course
Wailoa State Park, Hilo, HI 96720
The pin marks the address the race lists, which is usually the start. The organizers have not shared a course map with us yet.
Typical race-day weather
Around October 31 the day usually runs from 58°F at dawn to 69°F in the afternoon, with measurable rain on about 51% of days. Cold snaps dip to 55°F and hot years reach 71°F.
Based on 75 days within a week of the date over the last 5 years, from historical weather for the start area. Not a forecast.
Race details
- Where
- Wailoa State Park, Hilo, HI 96720Map
- Course
- Road
- Start elevation
- About 2,680 feet
- Distances
- Kids
- Editions
- 2026 (Oct 31, 2026), 2025 (Oct 18, 2025)
Organize this race? Add details or a correction
Plan your race
Quick answers
- When is BIRR Monster Mash Mile Fun Run?
- Saturday, October 31, 2026, starting at 9:00 AM.
- How much does it cost?
- Entry starts at Free before processing fees.
- When does registration close?
- Online registration closes Oct 29, 2026, unless the race fills first.
- What distances can I run?
- Kids.
- Where does it start?
- Wailoa State Park, Hilo, HI 96720.
From the organizers
Come Join us for the second Annual Monster Mash Mile Fun Run. Looking to test your speed or just enjoy a morning stroll. Then come join us for our Monster Mash Mile in Downtown Hilo at Wailoa State Park. *** Wear your best costume in celebration of Halloween:)
*Date: October 31, 2026 with a 9:00 am start for the 1 mile event and 9:30 am start for the kid’s shorter distance race.
**Location: Wailoa State Park in Downtown Hilo, Pavilion 2.
***Awards: top 3 male and female mile times. Top 1 of Best Costume male and female. Top 1 of stroller male and female. All kids will receive a prize for the kids race.