Rim-to-Rim Grand Canyon

The Rim-to-Rim Grand Canyon hike is the canyon's signature traverse — 34 km from the South Rim down to the Colorado River and back up to the North Rim, descending 1,500 m to the river and climbing 1,750 m up the other side. It's not the longest hike on this list but it is one of the most physically demanding, partly because the climbs come on already-tired legs and partly because temperatures swing from sub-zero on the North Rim in May to 40 °C in the inner canyon by midday.

The standard route descends the South Kaibab Trail from Yaki Point on the South Rim — 11 km, the shortest of the canyon's three corridor trails — through the Red Limestone walls to the Tipoff at the Tonto Plateau, then steeply down the inner gorge to the Black Bridge and Phantom Ranch. From Phantom Ranch, the North Kaibab Trail follows Bright Angel Creek north through cottonwood-shaded canyon to Cottonwood Campground, then climbs steadily through Roaring Springs and the Supai Tunnel up the dramatic Redwall switchbacks to the North Rim. Most fit hikers complete the traverse in 12–16 hours of moving time. The opposite direction (North to South) is gentler in descent but climbs longer up the South Kaibab.

The hike requires no permit for day-hikers but the National Park Service strongly discourages summer attempts — heat-related rescues are routine, and the inner canyon regularly hits 45 °C between May and September. Best season is mid-April to mid-May or mid-September to mid-October, when the rims are clear of snow and the inner canyon is below 35 °C. The biggest logistical challenge is getting back to your car: the rims are 350 km apart by road. Most hikers either pre-arrange a shuttle (operators run buses from $90 per person), do a 2-car shuffle with a friend, or stay overnight at Phantom Ranch or Cottonwood and walk back the same way (a Rim-to-Rim-to-Rim, the legendary "R3"). Carry 4+ litres of water; the only reliable water below the rims is at Phantom Ranch.