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I second Everglades.
That is one park you do not want to visit in the summer, or even spring and early fall! |
| We went to the Grand Canyon in January and it was terrific, and not terribly crowded. |
Only the South Rim is open at that time. The North Rim closes Nov-Mar. |
Being slightly nit-picky, but Los Padres is a National Forest (not Park) and Big Sur is a California State Park. I'm not really sure if it really matters, esp. as OP's question was vague. Lots of places in the US are quite "possible" to go to in the winter, regardless of their status as a national park. |
| Yellowstone |
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Big Sur/Ventana
Redwoods National Park Sequoia National Park (it gets cold, but you can still RV or camp and it is much further south than most of the Sierra parks) Tahoe area (not national park but good skiing all around incl. XC at Royal Gorge & Tahoe XC.) Yosemite - took a winter ecology class there, beautiful and deserted in winter, bring chains, stay at the lodge unless you are hardcore. Cross country, snowshoe, telemark skiing and downhill at Badger Pass. There is a nice little trail to the terrifying overlook at the top of Glacier Point. South Padre Island TX Everglades |
| Tried to camp at Zion one year for spring break in March, it snowed on us, Grand Canyon was also snowing so we headed to Nevada - Valley of Fire State park and Death Valley. |
| We've done Grand Canyon, White Sands, Saguaro, Joshua Tree, Everglades, and Dry Tortugas in the winter. |