The Boulder Creek Festival on Memorial Day Weekend
The Boulder Creek Festival takes place every Memorial Day weekend in Boulder along Boulder Creek, and features great free music, dancing, rides for the kids, and other entertainment. This is one of the best festivals of the year, and a great thing to do on Memorial Day weekend.
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.
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... 
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!
Golden Super Cruise Car Show (first Saturday monthly May-October)
The South Golden Road area around the Sonic drive-in is home to a very large monthly car show called the Golden Super Cruise. They typically hold this event on the first Saturday of every month from May through October. One of the best things to do in Golden on a Saturday evening.
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.
Colorado July 4th Fireworks 2017
Colorado puts on quite a celebration for Independence day, with a large number of fireworks shows across the state. There are events of all sizes in 2017. Here we list some of the larger shows both in the Denver metro area as well as across the state.
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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.
Colorado State Capitol Free Tours (Weekdays)
The Colorado State Capital is one of the popular Denver Attractions, not only for the well known '5280 step' but also for the free tours inside.
Why take a Colorado State Capitol tour? I'll give you three reasons:
- The Colorado State Capital building in downtown Denver allows you to watch our state Legislature in action. As more people take an interest in the workings of our government, this is a great opportunity to see firsthand how the system works. The Colorado State Legislature is in session from early January to early May.
- The capitol building itself is awash in history and amazing architecture. It was built using Colorado materials as much as possible, such as Colorado gold for the dome, granite walls from Granite, Colorado, and Colorado's distinctive red onyx throughout the interior.
- The views from the Dome tour are some of the best in Denver!
Location:
Just head for downtown Denver and the 16th Street Mall, you can't miss the gold domed building beyond the southern end of 16th street mall. The steps on the western side are the most popular area to enter as the "1 mile above sea level" markers are there. The civic center park area has become very sketchy, expect to encounter quite a few homeless if you walk through the park.
Visitors to the state capitol are allowed to wander the public areas on their own, or you can take one of several guided tours:
Historical Tours:
All about construction of the building and early Colorado history, as well as some of the more interesting artifacts on display within the building. Reservations are not required unless you have a group of 10 or more. Tours are 45 minutes long and are available weekdays except holidays.
Historical Tour Hours:
10am - 3pm every Monday - Friday
Legislative Tours:
Legislative tours are a popular field trip for Colorado grade school students. When possible, you will make stops in the House and Senate galleries to see the legislature in action. This tour is only for school groups and reservations are required.
Legislative Tour Schedule:
Annually, early January through early May. Reservations are required.
Dome Tours (currently closed):
This tour climbs a long spiral staircase to an indoor observation area with amazing views of Denver.
Dome Tour Hours:
Daily from 9am to 2:30pm. Reservations are required.
Dome tours are currently closed until further notice due to dome renovations.
Mr. Brown's Attic:
This exhibit area illustrates Colorado's history and the legislative process, and includes a hands-on children's area. The attic is open 9am to 3pm on weekdays and reservations are not necessary.
For more information about Colorado State Capitol Tours, visit the Colorado Legislative Council Site:
U.S. Air Force Academy Visitor Center and Chapel, Colorado Springs (always free)
The United States Air Force Academy at Colorado Springs has a unique visitor center and chapel area that is free and open to the public. Visitors can learn a wealth of information about the academy and it's history as well as view the planes on display. The Chapel is absolutely beautiful and due to it's unique architecture it's probably the most photographed building in all of Colorado.
Colorado Sports Hall of Fame (always free)
The free Museum at the Colorado Sports Hall of Fame at Invesco Field showcases the accomplishments of Colorado's finest athletes across many sports disciplines from the most popular spectator sports to little-known gems.
There are exhibits featuring many of the greatest triumphs in Colorado sports history, from the Broncos to Golf to women in sports, as well as an interactive Kid's Zone. There is also an exhibit honoring the National Sports Center for the Disabled and the Special Olympics.
Hours
September thru May: Thursday -- Saturday 10am to 3pm
June, July, August: Tuesday -- Saturday 10am to 3pm
Beware of special hours and closures before or during Broncos home games, contact the Museum to confirm hours.
Location
Invesco Field Gate #1 (western side)
For the latest info, check the Colorado Sports Hall of Fame web site:
Denver Zoo Free Days
The Denver Zoo free days are by far the most popular Denver free days for families with kids, and are typically held during the fall and winter.
Irish Snug Denver Happy Hour (Capitol Hill)
Happy hour at the Irish Snug just south of Denver offers cheap, quality food and more than affordable drinks. Their happy hour menu is offered every day from 3-7 and 10-12. A diner will encounter traditional Irish fare, such as corned beef sliders and sangers. If you don’t like Irish food, don’t worry. The Irish Snug also offers burgers, tex mex and sophisticated American bar food.
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.