Corridor Zone Recommended for hikers without previous experience at Grand Canyon. Maintained trails. Purified water stations. Paved roads to trailheads. Toilets, signs, emergency phones, and ranger stations. Use of private livestock (horses and mules only) allowed only when specified on permit.
Threshold Zone Recommended for experienced Grand Canyon hikers. Non-maintained trails. Scarce water sources. Dirt roads to trailheads. Pit toilets. Use of private livestock (horses and mules only) allowed with permit only on Whitmore Trail and on designated roads and trails on the rim.
Primitive Zone** Recommended for highly experienced Grand Canyon hikers with proven route-finding ability. Non-maintained trails and routes. 4-wheel-drive roads to trailheads. Occasional signs. No other developments. Use of private livestock (horses and mules only) allowed with permit only on the Ken Patrick Trail to Uncle Jim Trail to Uncle Jim Point and on designated roads on the rim.
Wild Zone** Recommended for highly experienced Grand Canyon hikers with extensive route finding ability. Indistinct to non-existent routes require advanced route finding ability. Water sources scarce to non-existent. No other development. Use of private livestock is not allowed.
** Primitive and Wild Zones are not recommended for use during summer months due to extreme high temperatures and the lack of reliable water sources.