Need a last-minute getaway this weekend? Think about a national park—or any federally managed public land. No entrance fees will be charged at any of them Saturday through Monday (Jan. 14-16), which is Martin Luther King Day.

All other fees (campground fees, tour fees and other concession fees) remain in effect. In this mostly snow-free winter, here is the forecast for Saturday (based on projections from Weather.com or NOAA) for 10 random national parks: