Sign In
Sign Up
My Events

Running

Running
Couch to 5K
5K
10K
Half Marathon
Marathon
See All ...

Outdoor

Outdoor
Camping
Hiking
See All ...

Triathlon

Triathlon
Sprint
Olympic/International
IRONMAN 70.3
IRONMAN
See All ...

Cycling

Cycling
Road Cycling
Century Rides
Mountain Biking
See All ...

Sports

Baseball
Basketball
Football
Golf
Martial Arts
Soccer
Softball
Swimming
Tennis
Volleyball
Winter Sports
Yoga

Calculators

Running Pace
Body Fat Percentage
Body Mass Index (BMI)
Ideal Weight
Heart Rate

Caloric Needs
Nutritional Needs
Basal Metabolic Rate (BMR)
Kids' Body Mass Index (BMI)

Running Events

Running
Couch to 5K
5K
10K
Half Marthon
Marathon
See All ...

Running Articles

Running
Distance Running
Trail Running
Mud Running
Training Plans
Product Reviews

Triathlon Events

Triathlon
Super Sprint
Sprint
Olympic/International
IRONMAN 70.3
IRONMAN
See All ...

Cycling Events

Cycling
Century Rides
Road Cycling
Mountain Biking
See All ...

Triathlon Articles

Triathlon
Duathlon
Training Plans
Product Reviews

Cycling Articles

Cycling
Mountain Biking
Cyclo-Cross
BMX
Training Plans
Product Reviews

Fitness Events

Fitness
Walking
Yoga
Strength Training
Pilates
Weight Lifting
See All ...

Fitness Articles

Fitness
Workouts
Walking
Yoga
Weight Loss
Training Plans
Product Reviews

Sports Events

Baseball
Basketball
Football
Golf
Martial Arts
Soccer
Softball
Swimming
Tennis
Volleyball
Winter Sports

Outdoor Events

Outdoor
Camping
Hiking
Book Campground
See All ...

Sports Articles

Sports
Swimming
Basketball
Tennis
Baseball
Soccer
Softball
Volleyball
Football
Lacrosse
Golf

Water Sports
Ice Hockey
Gymnastics
Martial Arts
Ski
Camping
Hiking
Travel
Sailing
Dance
Snowshoeing

Nutrition Articles

Nutrition
Meal Prep
Recipes
Snacks
Supplements
Product Reviews

Health & Injury Articles

Health & Injury
Physical Health
Mental Health
Pain
Injury Prevention
Recovery
Sleep
Product Reviews

KIDS

Infants (0-1)
Toddlers (2-4)
Big Kids (5-8)
Tweens (9-12)
Teens (13-18)

Events

Swimming
Basketball
Baseball
Soccer
Tennis
Volleyball
Football
Martial Arts
Childcare

Yoga
Cheerleading
Gymnastics
Dance
Music
Arts & Crafts
Kids Fitness
See All ...

Go Premium

ACTIVE.com

Events
Running

Running

Couch to 5K

5K

10K

Half Marathon

Marathon

See All ...

Outdoor

Outdoor

Camping

Hiking

See All ...
Triathlon

Triathlon

Sprint

Olympic/International

IRONMAN 70.3

IRONMAN

See All ...

Cycling

Cycling

Road Cycling

Century Rides

Mountain Biking

See All ...
Sports

Baseball

Basketball

Football

Golf

Martial Arts

Soccer

Softball

Swimming

Tennis

Volleyball

Winter Sports

Yoga
ACTIVE Kids

Sports Camps

Browse All Activites

Race Results
Calculators
Calculators

Running Pace

Body Fat Percentage

Body Mass Index (BMI)

Ideal Weight

Heart Rate
Caloric Needs

Nutritional Needs

Basal Metabolic Rate (BMR)

Kids' Body Mass Index (BMI)
Running
Running Events

Running

Couch to 5K

5K

10K

Half Marthon

Marathon

See All ...
Running Articles

Running

Distance Running

Trail Running

Mud Running

Training Plans

Product Reviews
Triathlon
Triathlon Events

Triathlon

Super Sprint

Sprint

Olympic/International

IRONMAN 70.3

IRONMAN

See All ...
Cycling Events

Cycling

Century Rides

Road Cycling

Mountain Biking

See All ...
Triathlon Articles

Triathlon

Duathlon

Training Plans

Product Reviews
Cycling Articles

Cycling

Mountain Biking

Cyclo-Cross

BMX

Training Plans

Product Reviews
Fitness
Fitness Events

Fitness

Walking

Yoga

Strength Training

Pilates

Weight Lifting

See All ...
Fitness Articles

Fitness

Workouts

Walking

Yoga

Weight Loss

Training Plans

Product Reviews
Sports
Sports Events

Baseball

Basketball

Football

Golf

Martial Arts

Soccer

Softball

Swimming

Tennis

Volleyball

Winter Sports
Outdoor Events

Outdoor

Camping

Hiking

Book Campground

See All ...
Sports Articles

Sports

Swimming

Basketball

Tennis

Baseball

Soccer

Softball

Volleyball

Football

Lacrosse

Golf
Water Sports

Ice Hockey

Gymnastics

Martial Arts

Ski

Camping

Hiking

Travel

Sailing

Dance

Snowshoeing
Nutrition
Nutrition Articles

Nutrition

Meal Prep

Recipes

Snacks

Supplements

Product Reviews
Health & Injury Articles

Health & Injury

Physical Health

Mental Health

Pain

Injury Prevention

Recovery

Sleep

Product Reviews
Kids & Family
KIDS

Infants (0-1)

Toddlers (2-4)

Big Kids (5-8)

Tweens (9-12)

Teens (13-18)
Events

Swimming

Basketball

Baseball

Soccer

Tennis

Volleyball

Football

Martial Arts

Childcare
Yoga

Cheerleading

Gymnastics

Dance

Music

Arts & Crafts

Kids Fitness

See All ...
ACTIVE Kids Articles

Need Help?

Event Organizers

ACTIVE WORKS®

From marketing exposure to actionable data
insights, ACTIVE Works® is the race management
software for managing & marketing your events.

Learn More Customer Login

Home
Boulder, Co
Outdoors

Outdoors in Boulder, CO

Find Things to Do Near You

Activities Near

Boulder, CO

SortMost Popular

Relevance Date Distance Most Popular
When

All Future Dates Next 7 Days Next 3 Months Next 6 Months

Any day Monday Tuesday Wednesday

Thursday Friday Saturday Sunday

From

To

Reset filter
Where

Any Distance Within 25 Miles Within 50 Miles Within 75 Miles Within 100 Miles Within 200 Miles

Your Location

Find Activities near you.

Add Home Address

Reset filter
Who
Any gender Male Female

All Ages Infants (0-1) Toddlers (2-4) Big Kids (5-8) Tweens (9-12) Teens (13-18) Adult (18+) Senior (50+)
Your Family Members

Find the best matches for the family!
Add new family member
Sign up or sign in to save your family members and make searching easier every time.

Reset filter
Activities

Include Virtual Events

Reset filter
More

Include Virtual Events

ACTIVE Advantage Eligible

Reset filter

Include Virtual Events

Eligible

Reset All Filters

Nov 15 2024

AOA: Thanksgiving Potluck @ Hiawatha Davis Jr.

City and County of Denver • Denver, CO

Mar 6 2025

AOA: Museum Talk: Denver Mountain Parks @ Highland

City and County of Denver • Denver, CO

Mar 5 2025

AS: Casual Group Ride

City and County of Denver • Denver, CO

Cycling

Feb 12 2025

AS: Casual Group Ride

City and County of Denver • Denver, CO

Cycling

Jan 16 2025

ODR: Snowshoe - Snowshoe Hare Trail

City and County of Denver • Denver, CO

Hiking

Jan 8 2025

AS: Casual Group Ride

City and County of Denver • Denver, CO

Cycling

Feb 20 2025

ODR: Snowshoe - Horseshoe Trail

City and County of Denver • Denver, CO

Hiking

Nov 7 2024

Fleming Mansion Final Walkthrough (~45 days before event)

City and County of Denver • Denver, CO

Jul 20-25 2025

Expedition Backpacking 7th-8th #COEX072025-1WEX

Avid4 Adventure • Louisville, CO

Hiking

Browse Outdoors Categories

Hiking

Outdoor Survival

Skydiving

Outdoors Tips & Advice

15 Must-Have Outdoors Apps
5 Urban Myths About Outdoors—Debunked
Outdoors Holiday Gift Guide
Spend Valentine's Day Outdoors
2014 Outdoors Holiday Gift Guide

Explore Similar Articles

Most Recent Articles

Explore Similar Articles

Add a Family Member

Edit Family Member

Adding family members helps ACTIVE find events specific to your family's interests.

1

Age

2

Gender

M F

3

Interests

All activities Cycling Duathlon Nutrition Outdoors Racing

Running Swimming Triathlon Walking Weight Loss Yoga

All activities Swimming Basketball Baseball Soccer Volleyball Tennis Golf Martial Arts

Cheerleading Gymnastics Dance Music Arts & Crafts Academics Fitness Yoga Outdoors

Delete family member

Please see your Privacy Rights for how your information is used.

Add a Family Member

Edit Family Member

Look for this banner for recommended activities.

Delete family member

Please see your Privacy Rights for how your information is used.

Are you sure you want to delete this family member?

Cancel Yes

Find activities close to home

Activities near you will have
this indicator

Within 2 Miles

Activities near you will have this indicator

Within 2 Miles

Error

To save your home and search preferences

Join Active or Sign In

To save your home and search preferences

Join Active or Sign In

Browse Categories

- Skill Level
- Any
- Beginner

- Nearby Cities
- Erie
- Longmont
- Westminster
- Arvada
- Golden

- Custom
- Tag1
- Tag2

ACTIVE is the leader in online event registrations from 5k running races and marathons to softball leagues and local events. ACTIVE also makes it easy to learn and prepare for all the things you love to do with expert resources, training plans and fitness calculators.

Follow ACTIVE

Facebook
Twitter
Pinterest
Instagram

Mobile Apps

ACTIVE.com App
Couch to 5K®
5K to 10K
Meet Mobile

Things To Do

Running Races
Triathlon Races
Cycling
Mountain Biking
5K Races
10K Races

Half Marathon
Marathon
Ultra Running
Trail Running
Mud Runs
Swimming

Popular on ACTIVE.com

San Diego
Los Angeles
New York City
Denver
Houston
Las Vegas

BMI Calculator
Calorie Calculator
5K Training
Couch to 5K®
Half Marathon Training
Marathon Training

View All Mobile Apps

More Things to Do

ACTIVE Network

Organizer Technology Solutions:

Earn Money Account Access

About ACTIVE.com
Sitemap
Terms of Use
Copyright Policy
Your Privacy Rights
Do Not Sell My Personal Information
Cookie Policy
Privacy Settings
Careers
Support & Feedback
ACTIVE Access
Registration Software
Social Media Guidelines
Community Policies

Cookie Settings

Mobile Apps
Couch to 5K® View All Mobile Apps

Follow ACTIVE

Full Site

Sitemap Terms of Use Copyright Policy Privacy Policy Do Not Sell My Personal Information Cookie Policy Privacy Settings Careers Support & Feedback Cookie Settings

ACTIVE ADVANTAGE

Get a free 30 day trial

"Whenever I'm shopping for something, I check ACTIVE Advantage first. Great merchants! Great products! Great value!"

— Ashley Garden City, GA

Get exclusive offers as a member!

Get Your 3rd Race FREE
Up to $10 off Event Fees
Get $50 off New Running Shoes

FREE pair of Pro Compression Socks
Up to 15% off GearUp
VIP Travel Discounts

...and more!

See All Benefits

Start Free Trial

After trial, membership is only $99.95 for a full year of exclusive savings.

EVENTS

Running

Outdoor

Triathlon

Cycling

Sports

CALCULATORS

Calculators

RUNNING

Running Events

Running Articles

TRIATHLON

Triathlon Events

Cycling Events

Triathlon Articles

Cycling Articles

FITNESS

Fitness Events

Fitness Articles

SPORTS

Sports Events

Outdoor Events

Sports Articles

NUTRITION

Nutrition Articles

Health & Injury Articles

Kids & Family

KIDS

Events

Go Premium

ACTIVE WORKS®

Outdoors in Boulder, CO

Find Things to Do Near You

Activities Near

Boulder, CO

From

To

Your Location

Your Family Members

AOA: Thanksgiving Potluck @ Hiawatha Davis Jr.

City and County of Denver • Denver, CO

AOA: Museum Talk: Denver Mountain Parks @ Highland

City and County of Denver • Denver, CO

AS: Casual Group Ride

City and County of Denver • Denver, CO

Cycling

AS: Casual Group Ride

City and County of Denver • Denver, CO

Cycling

ODR: Snowshoe - Snowshoe Hare Trail

City and County of Denver • Denver, CO

Hiking

AS: Casual Group Ride

City and County of Denver • Denver, CO

Cycling

ODR: Snowshoe - Horseshoe Trail

City and County of Denver • Denver, CO

Hiking

Fleming Mansion Final Walkthrough (~45 days before event)

City and County of Denver • Denver, CO

Expedition Backpacking 7th-8th #COEX072025-1WEX

Avid4 Adventure • Louisville, CO

Hiking

Browse Outdoors Categories

1

Age

2

Gender

3

Interests

Activities near you will have this indicator

Within 2 Miles

Activities near you will have this indicator

Within 2 Miles

Skill Level

Nearby Cities

Custom

Mobile Apps

Follow ACTIVE

Activities near you will have
this indicator