- The South Rim of the park is open year-round, but during peak months (March to November) you will have to rely on shuttle service on the South Rim's Hermit Road. Winter snow on the north side of the park forces the road to the North Rim to close during the winter months. North Rim lodges, cafes and other facilities are closed from mid-October to mid-May. Off-season visits to the North Rim are only possible on foot, snowshoes or cross-country skis. To visit the North Rim during the off-season, you will need a permit.
- The Grand Canyon's peak season begins in April and lasts until October. Once the North Rim opens in mid-May, the crowds increase even more. Visitors are recommended to arrive between 10 a.m. and 2 p.m. during peak season to avoid large crowds, lines and limited parking. Remember that car access on the South Rim is limited during summer months, so shuttle lines are quite common as well. Also, if you plan to stay in park lodging during peak season, make sure to book a reservation far in advance. Reservations are also essential for mule rides into the inner canyon.
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Since the Grand Canyon's elevation varies dramatically, temperatures can fluctuate by 25 degrees or more depending on where in the park you visit. Summer months can get quite hot, especially at the canyon's base at Phantom Ranch. The high elevation of the rims ensures that the summer climate is more temperate than in other areas of the park. Temperatures drop in the fall and spring, especially at night. Winter rim temperatures vary from below-freezing to the mid 40s, while the inner canyon maintains a pleasant 50-degree average in the winter.
From mid-July to August, monsoons can pour down on the canyon. Although the thunderstorms don't last long, their impact is great. Flash floods can hit various sections of the park, especially in slot canyons or other areas where rain water can't drain easily. If hiking during monsoon season, keep an eye on the weather forecasts and have access to higher ground once the skies open.
