Outdoor activities

in Boulder, CO

Discover outdoor activities in Boulder with Meetup. Whatever your interest, Meetup helps you connect with like-minded people.

Hiking

Hiking Mountain Lion Trail @ Golden Gate Canyon State Park (Moderate)

Hiking Mountain Lion Trail @ Golden Gate Canyon State Park (Moderate)

Sat, May 23 · 08:00 MDT

by Roaming Colorado & Beyond

*7:45 AM* CONTINENTAL DIVIDE OVERLOOK: FOWLER TRAIL & RATTLESNAKE GULCH!

7:45 AM CONTINENTAL DIVIDE OVERLOOK: FOWLER TRAIL & RATTLESNAKE GULCH!

Sun, May 24 · 07:45 MDT

by Alpine Adventurers Hiking

Walker Ranch Loop ~8 mi

Walker Ranch Loop ~8 mi

Sat, May 30 · 08:00 MDT

by Colorado Trailblazers 40+

Boulder Walk 180: Eastern Half of the Slow Marathon

Boulder Walk 180: Eastern Half of the Slow Marathon

Sat, May 30 · 08:30 MDT

by Boulder Ramblers

Walking

Talk Data - June Meetup

Talk Data - June Meetup

Thu, June 11 · 17:00 MDT

by Talk Data to Me

Boulder Reservoir "Beach" Walk Followed by Spitz Mediterranean

Boulder Reservoir "Beach" Walk Followed by Spitz Mediterranean

Sat, June 6 · 09:00 MDT

by Longmont Walks

St. Vrain Greenway
Morning Nature Walk

St. Vrain Greenway Morning Nature Walk

Tue, May 26 · 08:00 MDT

by Longmont Walks

NCAR Meander South

NCAR Meander South

Fri, May 22 · 13:00 MDT

by Boulder Social Hikers, Bikers and More!

Running

THURSDAY NIGHT Weekly Social Run at Shoes and Brews!

THURSDAY NIGHT Weekly Social Run at Shoes and Brews!

Thu, May 28 · 18:00 MDT

by Longmont Running

Achilles community run and walk

Achilles community run and walk

Thu, May 28 · 17:30 MDT

by Boulder Achilles running and walking

Run Bike Path-Flagstaff Loop

Run Bike Path-Flagstaff Loop

Sat, May 23 · 08:00 MDT

by Boulder Trail Running Breakfast Club

Bolder Boulder 10k

Bolder Boulder 10k

Mon, May 25 · 07:00 MDT

by Boulder Trail Running Breakfast Club

Cycling

Road bike ride to Berthoud

Road bike ride to Berthoud

Tue, June 2 · 09:00 MDT

by St. Vrain Cyclists - (prev. Longmont Easy Riders)

Spin Into the Setting Sun 2026 (A/B1/B2 at 5:30, B3 at 5:00)

Spin Into the Setting Sun 2026 (A/B1/B2 at 5:30, B3 at 5:00)

Tue, May 26 · 17:30 MDT

by St Vrain Chain Gang Bicycling Club (SVCG) - Longmont, CO

Bike Ride out to Sandstone Ranch

Bike Ride out to Sandstone Ranch

Fri, May 22 · 10:00 MDT

by St. Vrain Cyclists - (prev. Longmont Easy Riders)

Boulder - Super James - Meeker Park Loop

Boulder - Super James - Meeker Park Loop

Sat, May 23 · 07:45 MDT

by Rocky Mountain Cycling Club RMCC

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