Springtime in the Rockies means mud, and while some choose to step around the inconvenience, others embrace the season and dive head first into the sloppy goodness. Mud runs are popping up across the country, ranging from casual fun runs to 10k lung busters. Here’s a quick run down of Colorado’s filthiest summer offerings. 

1.) Copper Mountain, CO - Dirty Girl 5k Mud Run: 6/10 

As the name suggests, this untimed 5k obstacle course is just for the ladies. The 3.1 mile long course holds between 10 and 12 obstacles. Costumes and teams are highly encouraged. Registration fee: $65

2.) Copper Mountain, CO - Tough Mudder: 7/15-7/16

The Tough Mudder Colorado, presented by Merrell, will test your grit throughout the 10-12 mile course and 20 plus obstacles. Every participant gets a headband, Performance Finisher Tee, beer and insurance. Registration fee: $176 - $205

3.) Denver, CO - MuckFest: 7/15

Billed as "The Fun Mud Run," MuckFest offers a free beer (or soda) in the MuckFestival after the race. The 5k course offers a variety of obstacles, including the Spider Web, Shake & Quake, Big Balls and Tunnel of Love. Registration fee: $105

4.) Denver, CO - Rugged Maniac: 8/12

The Rugged Maniac is much more than a mud run. Food, beer and merchandise can be found throughout the event space and participants are encouraged to costume-up for the occasion. Expect to find at least 25 obstacles between you and your celebratory brew. Registration fee: $79

5.) Denver, CO - Terrain Racing Mud Run: 8/26

Register for either the 5k or 10k race and conquer the 25 obstacles standing in your way. Prize money will be awarded to the overall winners and a post-race party includes beer and food. Registration fee: $30 - $35