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Road · Half Marathon · Already run

Boulderthon Half Marathon

· starts 07:30
Boulder, CO

The race's site ↗

Boulderthon Half Marathon is a road race of 13.1 miles (21.1 km) in Boulder, Colorado. It was last run on Sunday, September 27, 2026, starting at 07:30. The race gives its climbing as 492 ft (150 m). Registration is open to all. The field is about 5,100 runners.

There are 59 other upcoming races up to a half marathon in Colorado. Boulderthon Half Marathon climbs about 38 ft a mile (7 m per km), steeper than 70% of the 170 races up to a half marathon listed with their climbing.

13.1miDistance
492ftClimbing
5,100runnersField
70°Flow 46°FTypical race day

Questions about Boulderthon Half Marathon

When is Boulderthon Half Marathon 2026?

Boulderthon Half Marathon 2026 was on Sunday, September 27, 2026, starting at 07:30 local time.

Where is Boulderthon Half Marathon?

Boulderthon Half Marathon is held in Boulder, Colorado.

How long is Boulderthon Half Marathon?

Boulderthon Half Marathon is 13.1 miles (21.1 km).

How much elevation gain does Boulderthon Half Marathon have?

Boulderthon Half Marathon has 492 ft (150 m) of elevation gain, as the race states it.

How do you get into Boulderthon Half Marathon?

Boulderthon Half Marathon has open registration.

What is the weather usually like at Boulderthon Half Marathon?

Around Boulderthon Half Marathon's date, the day's high is typically about 70°F (21°C) and the low about 46°F (8°C), averaged over recent years.

How hilly is Boulderthon Half Marathon?

Boulderthon Half Marathon climbs about 38 ft a mile (7 m per km), steeper than 70% of the 170 races up to a half marathon listed with their climbing.

What other races up to a half marathon are there in Colorado?

Other upcoming races up to a half marathon in Colorado include Louisville Trail Race (November 14, 2026), Louisville Trail Race (November 14, 2026) and Louisville Trail Race (November 14, 2026).

Other races in Colorado

Every race in Colorado

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