I go here when in the area, you need to make reservations ahead as it fills up fast, there are more closer ones to Boulder, but this is well worth the extra bit to get too. It has all the amenities if needed, the sights are worth it too. Its within 30 miles. about 45 min to Boulder Co.
Golden Gate Canyon State Park, Colorado
We plan to attend a music festival in Boulder, Colorado in late June and are hoping to combine the event with a road trip. Any suggestions of camping sites near Boulder? We'll be spending most of the days and evenings at CU campus or downtown Boulder so it would be helpful to find something within driving distance (hour away ok). Any suggestions are appreciated!