It is recommended that you carry tire chains in your vehicle between November and April, as a sudden storm could make them mandatory at any time. Due to changing weather conditions, under park regulations, any vehicle entering a chain control area must carry chains, even if their use is not mandatory at the time. This includes four-wheel drive vehicles. From October 15 until the roads open in the spring it is illegal to leave vehicles parked overnight along the Tioga Pass Road between Crane Flat and Tioga Pass, or along the Glacier Point Road east of Badger Pass Road, or at trail heads or any other areas accessible from these roads. Dispose of trash frequently.
Group size is limited to fifteen persons per group, traveling on established trails.
Any groups exceeding group size limitations must split into sub-groups, providing wilderness trips which begin within the park start from separate trail heads, and the group travels and camps at least mile apart at all times. Larger groups cause more physical impact than smaller groups. Special Permits Permits are required for any special event utilizing park areas. Special events are defined as sports events, pageants, regattas, public spectator attractions, entertainment, ceremonies, and similar events. These rules and precautions help decrease the chance of personal injury, property damage and increase the protection of Yosemite s Resources.