Frozen Dead Guy Days in Nederland (Annually in March)
2014's Frozen Dead Guy Days will be celebrated March 7 through March 9. The highlight of the event is really the Polar Plunge, where anyone can sign up to take a dive in a freezing pond. Some people do it for the thrill, some do it to raise money for charities, and some are just plain nuts. There is also a coffin race, hearse parade, music, and many other bizarre activities (frozen turkey bowling???). This is one of the most popular things to do in March for front range residents with cabin fever.
This is probably the wierdest festival I've ever heard of, even wierder than Manitou's fruitcake toss or Leadville's ski Joring. Come and learn about the history of the frozen dead guy and observe some of Nederland's finest citizens enjoying a day in the mountains.
Traffic can become a real problem for the small town so plan accordingly. Parking is available on the side streets but getting to them can take a while.
When:
March 7 - 9, 2014
Where:
The event is held in Nederland, Colorado (at the top of Boulder Canyon west of Boulder).
As more people down in town learn about this festival every year, it has grown from a small event for members of the mountain community to a really crowded winter festival for everyone in the front range. If the crowds don't bother you, come check it out:
Frozen Dead Guy Days Nederland Chamber web site: 
If you want to learn more before you commit to a trip to the mountains, read all about the frozen dead guy here:
Frozen Dead Guy Days Wiki:
Dinosaur Ridge in Morrison (always free)
This park in Morrison, Colorado (southwest of Golden) is really an outdoor museum, where you can hike or ride a shuttle as you examine evidence of Dinosaur activity in Colorado. One of the popular Colorado attractions for kids.
Evergreen Chamber Orchestra (Saturday February 2)
The Evergreen Chamber Orchestra will have a free performance on Saturday Feb. 2, 2013, 7pm at Evergreen High School. Talented students from area schools will participate with the Evergreen Orchestra in this free concert.
The Evergreen Chamber Orchestra Web Site:
http://www.evergreenchamberorch.org/
Rocky Mountain Arsenal Wildlife Refuge | always free
The free Rocky Mountain Arsenal Wildlife Refuge in Commerce City, Colorado (near Denver) is a beautiful and pristine National Wildlife Refuge, representing an impressive cleanup and conversion of a former weapons and rocket fuel processing facility. The views of the mountains from this perfect spot on the plains are quite impressive.
Denver Center for the Performing Arts ($10 tickets)
The Denver Center for the Performing Arts offers a limited number of $10 tickets, every Tuesday morning, for shows coming later in the week.
Old Globeville Days and the Orthodox Food Festival (annually in July)
The Old Globeville Days Orthodox Food Festival celebrates Denver's international immigrant heritage with a diverse selection of free entertainment and international food. The music features outstanding performers of diverse folk heritage including an amazing Celtic performance. The incredible food selection is sample sized and you purchase tickets to try the samples. One of the best things to do in Denver on a warm mid-July weekend.
Copper Country Music Festival (Labor Day Weekend)
Each year over Labor Day Weekend, Copper Mountain Ski Resort hosts the free Copper Country festival, with two full days of country, blues, and folk music from top name performers.
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Shell Gas Two For One Ski Ticket
For 2014, Shell gas stations are offering 2 for 1 vouchers at several ski areas with a 10 gallon gas fill up. This means that if you buy at least 10 gallons of gas, you get a coupon good for a free lift ticket if you purchase one full price adult lift ticket. The deal is good at several ski areas.
Unfortunately, full price adult lift tickets have become so expensive that this isn't much of a "deal". But if you just want to ski one day at a participating resort this year, this will get you on the slopes for less than full price.
In Colorado, 2014's participating resorts are:
Copper Mountain
Crested Butte
Loveland
Monarch
Powderhorn
The SkiFreeDeals.com web site has a full list of participating Shell stations and ski resorts.
Learn more at skifreedeals.Com:
Colorado Railroad Museum in Golden (free days)
The top Colorado attraction for train enthusiasts also has free days! A few free days are held each year at the Colorado Railroad Museum in Golden. This museum features a diverse collection of trains, some restored and some not, located outdoors. You can climb aboard some of them. There are also indoor museum exhibits and a huge indoor miniature train layout that is operated by quarters.
Colorado Ski Museum & Snowboard Museum at Vail (always free)
The Colorado Ski Museum & Snowboard Museum in Vail Village celebrates Colorado's rich ski history with a huge collection of artifacts and exhibits covering the whole of ski and snowboard history in Colorado.
McLoughlin's Restaurant and Bar (Downtown Denver)
McLoughlin's is one of my go-to places when I'm craving happy hour specials in downtown Denver.
The Hornet Denver Happy Hour (SoBo district)
When perusing the happy hour menu at The Hornet in SoBo, just south of downtown Denver, you really only need to ask yourself one question- What will I order with my Bacon and Brie Home Fries? Yes, you read that right, you can order a plate of home fries piled with creamy brie cheese and salty bacon. What else can a person want?
Aspen Nordic Center (always free)
For vacationers to Aspen, the Aspen Nordic center provides probably the ultimate cross country ski and snowshoe experience in Colorado, and it is entirely free!
Patsy's Candies Tour in Colorado Springs (always free)
Patsy's Candies in Colorado Springs takes the making of chocolate candy to a whole new level. Free tours of their factory demonstrate the handcrafted nature of Patsy's Candies and highlight the artisanship present in their high quality candies.