Clear Creek History Park, Golden (always free)
Clear Creek History Park in downtown Golden is now free to walk through, sunrise to sunset every day.
Manitou Springs Great Fruitcake Toss Festival (annually in January)
Colorado is known for it's goofy festivals and the Great Fruitcake Toss is certainly one of the headliners. This Manitou Springs tradition is held every year after the holidays in an effort to dispose of certain unwanted confections you may have acquired.
Some people prefer to launch their cakes by hand but many choose to build elaborate contraptions to give their fruitcakes the send off they deserve. There are various cake launching categories as well as competitions for the best and prettiest fruit cakes.
When:
The 2014 Great Fruitcake Toss festival has been cancelled. Hopefully it will be back in 2015.
Where:
In Manitou Springs at the Manitou Springs High School track.
401 El Monte Place
Manitou Springs, CO 80829.
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.
Buffalo Bill's Birthday (February)
Golden, Colorado celebrates Buffalo Bills birthday in grand style every year at Rock Rest Lodge. This free festival features re-enactments of the wild west days as well as great music, food, and western authors.
City Park Jazz
Looking for free Denver music? City Park in downtown Denver has a free summer jazz concert schedule with top performers.
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:
Free Summer Bowling For Students at Brunswick Bowling Centers
Brunswick Bowling Centers are offering free bowling for students during the summer of 2012. Kids or their parents (depending on age) sign up for Brunswick's Bonus Zone to get free bowling.
There are a few Brunswick Bowling Centers along the front range that offer the free bowling for kids promotion.
Find a bowling center:
Bonus Zone Sign up:
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Budweiser Tour in Fort Collins (always free)
The Budweiser tour in Fort Collins ranks right up there with the Coors tour in the battle of the Colorado beer tours. Anheuser-Busch has offered very professional and detailed tours of their Fort Collins brewery for many years and the popularity continues to grow.
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.
Colorado School of Mines Geology Museum in Golden (always free)
If you are spending a day in Golden and looking for free attractions, The Colorado School of Mines Geology Museum has a large display of rare gemstones, and their mining display downstairs should not be missed! One of the main attractions at the School of Mines Geology Museum is a moon rock collected during the Apollo 17 lunar mission!
When:
Monday - Saturday 9am - 4pm
Sunday 1pm - 4pm
Where:
1310 Maple St., Golden, CO 80401
The Museum is located in downtown Golden on the Colorado School of Mines campus, in the General Research Library building.
Check their web site for details:
Lookout Mountain Nature Center (always free)
This free nature center on top of Lookout Mountain in Golden is one of the top things to do in Colorado with the kids.
Winter Trails Day (annually, in January)
Winter Trails Day is a nationwide event, with free or discounted access to many cross country (nordic) ski trails and snowshoe trails, free tours, free rentals, and that sort of thing.
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!
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.