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.
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.
2017 National Park Free Days
The National Park Service offers free entrance to all National Parks a few times each year. This is a great way to explore our beautiful Colorado park lands.
Jefferson County Open Space Parks (always free)
Jefferson County Open Space Parks are probably the best park value in Colorado. A tremendous variety of parks and activities, such as hiking, mountain biking, climbing, and geocaching, all free to anyone.
Here is a list of their parks, maps, details, etc... 
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.
Sunnyside Music Festival (mid-September)
The free Sunnyside Music Festival is a showcase of Colorado talent that takes place each year in Denver's Sunnyside neighborhood.
Colorado Free Fishing Weekend (First Weekend in June)
On the first weekend of June each year, Colorado waives fishing license requirements. This is a great chance to grab your gear out of storage and take the family to a nearby lake or stream for some serious trout fishing!
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Euclid Hall Denver Happy Hour (Downtown Denver)
OK, I normally make it a policy to only check out Denver happy hours that have food specials with drink specials. However, when I saw that that 5280 had deemed Euclid Hall the best Denver happy hour, I had to check it out for myself. I went in skeptical, and came out satisfied and stuffed.
Denver Restaurant Week 2016 (Feb 26 - March 6)
For 2016, Denver will be celebrating Restaurant Week in February and March. Denver Restaurant Week features top downtown restaurants for a reduced price.
New Belgium Brewery Tours (Tuesday - Saturday)
The New Belgium Brewery in Fort Collins has had to greatly modify their previously awesome tour and beer sampling system. They never said why they changed, but it was obvious what the problem was when I visited. Because of the free beer samples, the place was overrun with college kids who wanted to party hard for free.
Now to get a small free sample you must take the full brewery tour, and reservations fill up online weeks or months in advance. If you go there without being signed up for a tour, you can still buy beer at the bar for a discounted rate.
Despite the changes, this is still an excellent small brewery to see and learn about.
Location: 500 Linden Street in old town Fort Collins.
Liquid Center Hours:
Tuesday - Sunday 10am to 6pm
Closed on Sundays until Feb 9th, 2014.
Guided Tour Hours:
Tuesday - Sunday 11am to 4:30pm
Closed on Sundays until Feb 9th, 2014.
New Belgium Beer Web Site:
Olympic Training Center Tours in Colorado Springs (always free)
The United States Olympic Training Center in Colorado Springs is the home of a huge Olympic visitor's center, the U.S. Olympic Hall of Fame, and serves as the training center for many of our country's top athletes. A free tour of the Olympic Complex is one of the best things to do in Colorado Springs.
Denver Museum of Nature and Science (free days)
One of the top things to do in Denver with older kids, the Denver Museum of Nature and Science is a hands-on educational museum that kids love!
Liftopia Ski Discounts
Colorado resorts offering substantial Liftopia ski discounts:
Arapahoe Basin.
Copper Mountain.
Durango.
Loveland.
Monarch Mountain.
Ski Cooper.
Sunlight.
Winter Park.
Some other resorts have discounts on Liftopia that really aren't discounts at all.
Check out Liftopia:
Rentals
If you need to pick up rentals on your way to the mountain, my favorite super cheap rental shop is Maison De Ski in Idaho Springs.
Denver Museum of Miniatures, Dolls, and Toys
For the dollhouse fan in every little girl at heart, the Denver Museum of Miniatures, Dolls, and Toys has a Community Day on the first Sunday of every month, from 1 pm to 4 pm.