• when — though the Grand Canyon is typically thought of as very hot, it actually drops to 35-55°F in the Inner Gorge in winter [2]
  • it does snow there sometimes (though the snow becomes rain before it reaches the canyon floor)
• airports — fly into Las Vegas, Flagstaff, or Phoenix
• transportation to the site
  • the road to the North Rim is closed in winter, but the South Rim is still available
  • public transportation options to the South Rim: [2]
    • there's are two periodic shuttle van companies [2]
    • there's a daily train
    • the Tusayan ⇔ shuttle doesn't run over winter, and it starts around the second week of May
• transportation within the site
  • there are shuttle buses that travel along the South Rim drive
• campgrounds with electrical hookups?
  • Grand Canyon Camper Village
  • Trailer Village RV Park (paved!)
• places to rent bicycles
  • inside the National Park
  • at Flagstaff
• park info
  • it's $12 per pedestrian for 7 day pass into park, or $25 per car for day pass
• guide services / supply shops / rental shops — hiking, climbing, camping, etc
  • Tusayan, AZ (pop. 550)
    • ...?
  • Williams, AZ (pop. 3000)
    • Marvelous Marv's
    • Grand Canyon Rentals and Tours — dirtbikes, ATVs
  • further away
    • WayFarOutAdventures.com [Prescott Valley, AZ]
    • AllStarGrandCanyonTours.com [Flagstaff, AZ]
    • thecenterfocus.com [Sedona, AZ]
    • DiscoveryTreks.com [Flagstaff, AZ?]
    • PygmyGuides.com [Flagstaff, AZ]
    • WildLandTrekking.com [Flagstaff, AZ]
    • FSGuides.com [Flagstaff, AZ]
    • GrandCanyonHikes.com [Flagstaff, AZ]
    • RubiconOutdoors.com [Prescott, AZ]
• guide services / supply shops / rental shops — rafting
  • Grand Canyon River Outfitters Association

Advice: Get some titanium tent stakes, so you can pitch your tent even if the ground is frozen.