Denver

Denver runs hot for pickleball. Mile-high air, 300 sunny days, and a public-park system that bought into the sport early. You'll find courts at almost every neighborhood park between Boulder and Castle Rock, plus a growing set of indoor clubs in Lakewood, Englewood, and Centennial that catch the snow days.

Most of the city's outdoor courts are free, painted lines on existing tennis surfaces, and busy on weekend mornings. If you want guaranteed play, head for SportyPickle, The Picklr, or Chicken N Pickle, which run drop-in sessions, leagues, and weekend tournaments. Crown Hill, Holly Tennis Center, and Bear Valley Park draw the strongest morning crowds. Lit courts (Cook Park, Gates Tennis Center, and most rec centers) extend play into the evening.

Bring a paddle and a water bottle, you can usually find a fourth.