Races
Go Big 100
Volcano Village to Kailua-Kona. One hundred miles of Big Island pavement. Five thousand up, nine thousand down. Crew and drops are on you.
- Start3,911 ft
- High12,137 ft
- Low92 ft
- Finish92 ft
- Volcano Village at mile 0.0
- Volcano to Kona at mile 10, cutoff 9.600000000000001 hours
- Hawaii at mile 20, cutoff 19.200000000000003 hours
- Go Big 100 mile 31 at mile 31, cutoff 28.799999999999997 hours
- Go Big 100 mile 41 at mile 41, cutoff 38.400000000000006 hours
- Finish Kailua at mile 51, cutoff 48 hours
Field, 2025 · 6-year sampleresults
Geometrycourse math
Weather at the cruxcourse math
At hour 6 of race, feels like 24 C (72 F).Sample of 7 race days, medium confidence.At hour 6 of race, apparent temperature P90 is 24 C / 75 F.
The cruxDescent from Volcano toward Kona in afternoon heat (near mile 33)
Course DNA
The Course
Go Big 100 runs 51 mi through Volcano to Kona, Hawaii. +8,658 ft gain and -12,477 ft loss. Surfaces skew 100% pavement. Descent from Volcano toward Kona in afternoon heat. High point near 12,137 ft. Low near 92 ft. December temps run 60°F to 85°F. The course rewards patience early and punishes rushed descents after mile 26.
The Work
Train for 8,658 feet of climbing across 51 mi. Back-to-back long runs on similar surfaces. Practice power-hiking grades above 15 percent. 48 hours total means limited margin: rehearse fueling every 45 to 60 minutes and downhill eccentric work weekly. Technicality 8/10. Build a block that simulates the crux near mile 33.
Kit
December in Volcano to Kona, Hawaii: plan for 60°F to 85°F. Mandatory shell if rain is in forecast. Headlamp with spare batteries if 48 hours pushes past dark. Poles help on sustained climbs above mile 13. Vest capacity for 2 liters minimum. Shoes matched to 100% pavement: lugs for mud, rock plate if the course turns technical after mile 26.
Race Day
Hold effort through mile 13. The field often splits on the first big climb after mile 26. Descent from Volcano toward Kona in afternoon heat near mile 33 is where time is won or lost. Walk the steep pinches. Run the flats and gentle downhills. Crew at major aids: socks, calories, ice if hot. Transitions under 5 minutes when possible. Final third is 17 miles of fatigue management. Finish with reserve for the last descent.
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Sources (1)
- Field stats (2025): https://ultrasignup.com/results_event.aspx?did=132335