5K
5 km
Boulder
2026-09-27
Open entry

Boulderthon 5K

Official event website & entry ↗Plan my paceData current as of 2026-07-06

Decision summary

Boulderthon 5K at a glance

Typical conditions: 81/100
Evidence depth: 20 verified facts

Route details

Known course facts at a glance

Methodology →

Boulderthon 5K has known course details for its 5k race. The summary below keeps the focus on what is confirmed for the course.

Official distance: 5 km
Terrain: Road
Scenery: City, Coastal, Mountain, Lakeside, Countryside

Quick answers

What runners ask first

Where does the Boulderthon 5K route go?

The Boulderthon 5K route starts at Pearl Street Mall, downtown Boulder. Underfoot, expect a road course.

Race character

Scenery

City
Coastal
Mountain
Lakeside
Countryside

Atmosphere

Big City
Festival
Destination

Terrain

Road

Entry, logistics and records

Records and field

Field size: 15000+ participants across all distances

Entry requirements

Entry status: Open entry: The held registration model is open entry and this edition is not marked sold out.

Race day logistics

Expo / packet pickup: Lively Race Expo on Pearl Street Mall (between 14th & 15th) with 70+ local and national partners; official bib pickup Fri 9/25 2pm-6pm and Sat 9/26 10am-6pm
Race village: No
Medal: All finishers receive a limited-edition finisher medal and finisher shirt
Finisher tee: Finisher technical shirt from lululemon

Access and course status

Start: Pearl Street Mall, downtown Boulder

Course facts

Notable features: First-come first-served registration
race typically sells out and has grown to be one of the fastest-growing fall races in the US
finisher technical shirts provided by lululemon
5K (Heart to Heart) with a kids run also offered on the same weekend

What are typical race-day conditions?

16°CTypical temperature
14 kphTypical wind
1 mmTypical rainfall
81Favourability /100

Typical conditions for the race date and locality, warmer than the endurance-optimal window. These are climatological norms, not a forecast, and are shared across every distance at this event.

Loading race page

Entry, logistics and records

Records and field

Field size: 15000+ participants across all distances

Entry requirements

Entry status: Open entry: The held registration model is open entry and this edition is not marked sold out.

Race day logistics

Expo / packet pickup: Lively Race Expo on Pearl Street Mall (between 14th & 15th) with 70+ local and national partners; official bib pickup Fri 9/25 2pm-6pm and Sat 9/26 10am-6pm
Race village: No
Medal: All finishers receive a limited-edition finisher medal and finisher shirt
Finisher tee: Finisher technical shirt from lululemon

Access and course status

Start: Pearl Street Mall, downtown Boulder

Course facts

Notable features: First-come first-served registration
race typically sells out and has grown to be one of the fastest-growing fall races in the US
finisher technical shirts provided by lululemon
5K (Heart to Heart) with a kids run also offered on the same weekend

Boulderthon 5K

Boulderthon 5K at a glance

Known course facts at a glance

What runners ask first

Where does the Boulderthon 5K route go?

Race character

Scenery

Atmosphere

Terrain

Entry, logistics and records

Records and field

Entry requirements

Race day logistics

Access and course status

Course facts

What are typical race-day conditions?

How we calculated this

Boulderthon 5K

Boulderthon 5K at a glance

Known course facts at a glance

What runners ask first

Where does the Boulderthon 5K route go?

Race character

Scenery

Atmosphere

Terrain

Entry, logistics and records

Records and field

Entry requirements

Race day logistics

Access and course status

Course facts

What are typical race-day conditions?

How we calculated this

Boulderthon 5K at a glance

Known course facts at a glance

What runners ask first

Where does the Boulderthon 5K route go?

Race character

Scenery

Atmosphere

Terrain

Entry, logistics and records

Records and field

Entry requirements

Race day logistics

Access and course status

Course facts

What are typical race-day conditions?

How we calculated this

Related mapped-route collections

5K route maps

Boulderthon 5K at a glance

Known course facts at a glance

What runners ask first

Where does the Boulderthon 5K route go?

Race character

Scenery

Atmosphere

Terrain

Entry, logistics and records

Records and field

Entry requirements

Race day logistics

Access and course status

Course facts

What are typical race-day conditions?

How we calculated this

Related mapped-route collections

5K route maps