How to Keep a Tent Cool: Shade, Airflow and Timing, Step by Step

Pick shade and a breeze

Think about where the shade will fall in the heat of the day, advises Savanna Frimoth of Snow Peak, quoted by Backpacker, because a site in hot sun at the hottest hour is, in Backpacker’s words, “going to retain heat into the evening”. The National Weather Service camping tips say to set up in the shade and “Face your tent door into the wind.” NEMO, a tent maker, suggests pitching “on high ground where it is more likely to take advantage of some wind”, and Backpacker says higher spots may also give a better chance of a breeze.

Pitch late and plan the day

The National Weather Service office in Blacksburg suggests you “Disassemble your tent after waking up and assemble it again once the sun is down.” That suits a short stay, not every trip. White Duck advises setting up camp in the evening and, when you can, staying outside the tent in shade from 11 AM to 4 PM. The CDC page on heat says to “Do outdoor activities during the coolest parts of the day or evening, if possible.”

Open every vent and door, high and low

NEMO describes a “high-low” system, where cool air enters from ground-level vents and hot air leaves through roof-level openings. White Duck’s advice is to open everything you safely can: mesh windows, doors and roof vents, so air moves through rather than sitting still.

Take the fly off only where the maker allows it

Backpacker says “If you’re confident that rain isn’t in the forecast, leave your fly off.” Check your manual first: MSR says 3-season tents have “more mesh for breathability and airflow”, but a single-wall tent or one with a solid inner body cannot go without its fly. Big Agnes documents a “fast fly” setup for its tents, fly, poles and footprint, without the inner tent, that can be used “to increase tent ventilation”. With no fly you have no rain cover, so put it back if rain is possible. If the fly stays on, Big Agnes says to “Keep a healthy distance between your rain fly and tent body for maximum ventilation”, which means staking it out and using the guylines.

Shade the roof with a reflective sunshade

The National Weather Service camping tips say “Use a reflective sunshade”, and White Duck says “No natural shade? Make your own with a sunshade tarp.” Hang it on its own lines, not on the tent, and leave a gap. White Duck suggests “Position tarps 18-24 inches above your tent”; Appalachian Outfitters, a gear retailer, gives a minimum of “at least 30 cm” (about 12 inches). A tarp lying on the fly is just another heated layer; Appalachian Outfitters says one draped onto the tent “provides limited benefit”.

Use cool water and wet cloths

The National Weather Service says “Keep a wet towel or bandana on the back of your neck to help you stay cool”, and “Stay hydrated! Whether you feel thirsty or not, drink plenty of water to avoid becoming dehydrated”. White Duck suggests draping wet towels over the tent or spraying down canvas tents with water. Appalachian Outfitters says this “works best during the cooler evening hours rather than midday”. For sleeping, Backpacker suggests freezing a water bottle before the trip and perching it under your neck; it suits one night better than several, because the freeze does not last. Its writer quotes Meg Callahan, a writer and hiker, that as it melts it is drinking water the next day.

Add a battery fan, but only below about 90°F

Appalachian Outfitters suggests one fan to “draw warm air out through an upper vent”. Fans have a limit. The National Weather Service says “Using a fan to blow air in someone’s direction may actually make them hotter if heat index temperatures are above the 90s”, and the CDC says that above 90°F indoors “a fan can increase body temperature”. Check the heat index, and skip the fan when it is that high.

Power cooling safely

EcoFlow, which sells portable air conditioners and power stations, says its WAVE 3 manual tells you in an enclosed tent to “attach the rear intake and exhaust ducts and run both of them outside”; follow your own unit’s manual. The CPSC, the US consumer product safety agency, says: “Never use portable fuel-burning camping equipment inside a home, garage, vehicle or tent unless it is specifically designed for use in an enclosed space and provides instructions for safe use in an enclosed area.” For generators it adds: “Never operate a portable generator or any other gasoline engine-powered tool either in or near an enclosed space such as a garage, house, or other building. Even with open doors and windows, these spaces can trap CO and allow it to quickly build to lethal levels.” Use a battery or a campsite hookup instead.