Warm summer months and long weekends draw the biggest crowds, while spring is the best time to spot wildlife. Although the park is hardest to access in winter, it can be the most rewarding time to go. Yellowstone has five entrances, four of which are closed to wheeled vehicles during winter months (early November to late April). The park is quite far from any major airport but a few hours' drive from several small airports. Hotels, restaurants, gas, groceries, and souvenirs are all available inside the park. Some facilities and campgrounds are closed seasonally, and campsites in popular spots fill up quickly.