Camping in the rain: the routines that keep a trip alive

The difference between a wet trip that works and one that ends early is almost never the tent. It is whether there is a covered space that is not the tent. Without one, everybody spends a rainy afternoon lying down in a nylon room and the trip is over by 4 pm. With a tarp over a table, rain becomes background noise.

Arriving in rain, in the only order that works#

The instinct is to get the tent up first. That is wrong: it leaves you unpacking a car into rain and carrying wet things into the one dry space you built. Reverse it.

1. Read the site before opening anything. Find the high point and see where water will run. A puddle now is a pond by midnight, and our notes on pitching and site selection cover reading ground.
2. Put the tarp up first, over the working area. Ridge along the wind, windward edge low, every panel sloped. Five to ten minutes, and every later step happens under it.
3. Move only what you need under the tarp. Tent bag, pegs, mallet, kitchen box, dry clothes. The rest stays in the car.
4. Pitch the tent, outer first or all in one if it offers that mode. If it is strictly inner first, pitch under the tarp where headroom allows.
5. Set the boundary before anything enters the tent. A mat at the door and a rule about boots. This step gets skipped, and the rest depends on it.
6. Move gear in dry side first. Sleeping bags and mats before anything wet nears the door, and keep them bagged until the floor is dry.
7. Change out of travel clothes immediately, even if they feel only slightly damp. Damp clothing worn through the evening starts most cold nights.
8. Set the kitchen under the tarp, not in the porch. Cooking vapour is water, and a porch vents into the inner.
9. Then sit down. Everyone is dry, there is a roof over the table, and nothing moves again in the dark.

With children the order matters more, because the window in which they will stand about in rain is short, as camping with young children covers.

Wet and dry zones in a family tent#

One wet item in the sleeping area contaminates everything, because the moisture does not stay in it: it evaporates, saturates the air and condenses on the coldest surface available, usually the fabric beside somebody's head.

What makes this work is the doormat, not the discipline. People will not remember a rule, but they stop at a physical object. A mat at the inner door, a boot tray and a labelled dry bag per person do more than any instruction, and cost almost nothing in boot space, as camp comfort and furniture sets out. Wet outer layers live under the tarp on a line, not in a porch full of still saturated air.

The litre of water you carry in on your clothes#

Do the arithmetic once and the zone discipline stops feeling fussy. A soaked cotton garment can hold close to its own dry weight in water, so a 600 g hoodie carries perhaps 500 to 900 g. Across a family, call it a litre, or a kilogram of water.

Now the tent. A four-person inner roughly 2.2 by 2.4 metres with average headroom near 1.2 metres holds about 6.3 cubic metres of air. At 10 degrees C, saturated air holds about 9.4 grams of water per cubic metre, so the whole volume carries about 59 grams at 100 percent humidity. Divide 1000 by 59: you have brought in roughly 17 tent volumes of vapour. It condenses on the coldest surface, the flysheet, and on the inner wherever the two touch.

That is before anyone breathes. Four sleepers giving off 40 to 70 grams per hour over nine hours add 1.4 to 2.5 kilograms, another 24 to 42 tent volumes. Ventilation is not optional, and the venting geometry is in our guide to tent condensation. The rules follow: wet items do not enter, vents stay open even though it feels wrong in rain, nothing cooks inside, and bodies do not touch the inner wall.

Wet insulation is the danger, not the discomfort#

Being wet and cold is unpleasant. Being wet, cold and insulated by nothing is dangerous, and the two feel similar until late.

Insulation works by trapping still air, which conducts heat at about 0.026 watts per metre kelvin. Water conducts at about 0.6, roughly 23 times faster, so when water displaces the air in a fleece or a down baffle the material becomes a wet layer against skin. Add wind, which strips the boundary layer, and the heat balance goes negative fast.

That is why wilderness medicine literature describes accidental hypothermia outside alpine settings as a phenomenon of cool, wet, windy days rather than freezing ones. Roughly 5 to 12 degrees C with soaked clothing and moving air is the classic combination: warm enough that nobody takes it seriously, cold enough that a wet person cannot keep up. The early signs are behavioural: clumsiness, quietness, poor decisions.

Two defences matter most. The first is a dry insulating layer per person, kept in a dry bag and never used until needed; synthetic fill holds a usable fraction of its loft when damp, whereas wet down collapses. The second is a shell that keeps rain out and lets vapour through, both tested: hydrostatic head under ISO 811, water vapour resistance under EN 343. Our page on rain jackets and breathability explains why a shell can keep rain out perfectly and still leave you soaked from within.

What to do with each category of wet gear overnight#

Not everything gets the same treatment, and piling it into the porch is wrong for most of it.

Drying gear without a fire#

Evaporation needs energy and somewhere for the vapour to go. On a wet weekend you have neither sun nor fire, so you work with body heat and moving air.

Energy. Evaporating water at ambient temperature costs roughly 2450 joules per gram, so damp socks holding 50 grams need about 122 kilojoules. A resting adult produces 70 to 100 watts; at 80 watts over eight hours that is 80 x 3600 x 8, or about 2.3 megajoules. The socks cost around 5 percent of that, which is affordable. Run the same sum on a fleece holding 500 grams: 500 x 2450 is 1.23 megajoules, over half the night's total. You will not dry it, you will just be cold, and the water ends up in your sleeping bag.

Air. Evaporation rate depends on the difference between vapour pressure at the wet surface and in the surrounding air, and on how fast that air is replaced. In saturated still air the difference is zero and nothing dries at any temperature. Hence a porch being a poor drying room and a breezy line under a tarp a good one.

• Wring first, hard. Removing 200 grams by hand saves 490 kilojoules of evaporation.
• Body-dry small thin items only: socks, gloves, a hat, held at your torso.
• Everything else goes on a line in moving air, under cover, spread rather than bunched.
• Never dry boots or synthetic fabric near a stove. Melting happens well below the temperature at which you smell anything.

Leaving in the rain, and the two day rule at home#

The departure routine is the arrival routine reversed, plus the step that decides whether the tent survives.

1. Pack the inside first, while the tent still stands and is dry inside, sealing bags and clothes into dry bags before the door opens.
2. Move the dry bags to the car, not the tarp.
3. Pack the kitchen under the tarp and load it.
4. Strike the tent, leaving the tarp up. Poles out, shake the fly, fold it wet side inwards so the dry inner never touches it.
5. Bag the tent wet and separately, in a large bag rather than its stuff sack, where it wets nothing else.
6. Strike the tarp last. It is the only cover you have and it dries fastest at home.
7. Sweep the ground anyway. Pegs vanish into wet grass, and one lost peg ends the next trip.

Then the part that matters. Mould establishes on damp materials within 24 to 48 hours, and once in a coated fabric it is not fully removable. Moisture and warmth also accelerate hydrolysis of polyurethane coatings, which turns a flysheet sticky and leaky years early. Unpack the tent the day you get home, or the next day at the latest, and pitch it somewhere with airflow until both faces, the seam tape and the peg points are dry. Dry the stuff sack and peg bag too, then store everything loose and cool, for the reasons in storing gear between trips.

Common mistakes in wet weather camping#

Pitching the tent first. It guarantees an opening hour spent carrying wet things into your only dry space.

Closing all the vents because it is raining. Vents under a fly admit air, not rain. Closing them turns condensation into a soaking.

Wearing the emergency dry layer on day one. Once damp it is not an emergency layer, just another wet garment.

Leaving the tent bagged wet for a week. The most expensive mistake here, and entirely avoidable.

Frequently asked questions#

How do you pitch a tent in the rain without soaking the inside?#

Put a tarp up first over the working area, then pitch under or beside it. If the tent goes up outer first or all in one, use that, because the inner never sees the sky. If it is strictly inner first, carry it across already pitched, or accept a damp floor and wipe it before bags come in.

Why does the inside of my tent get wet when it is not leaking?#

Because people are humidifiers. Four sleepers give off roughly 40 to 70 grams of water per hour each, so 1.4 to 2.5 kilograms overnight, while the air in a 6.3 cubic metre tent holds only about 59 grams at 10 degrees C. The rest condenses on the coldest surface, usually the fly. Ventilation and keeping wet gear out are the fixes.

Can I dry wet clothes overnight in my sleeping bag?#

Only small thin items. Evaporating water costs about 2450 joules per gram, so 50 grams in a pair of socks needs 122 kilojoules, around 5 percent of a resting adult's overnight heat output. A soaked fleece holding 500 grams needs 1.2 megajoules, over half of it. Socks, gloves and a base layer yes, anything thick no.

At what temperature does hypothermia become a risk when camping?#

Far warmer than most people expect. Outside alpine settings the pattern described in wilderness medicine literature is roughly 5 to 12 degrees C with wet clothing and wind, because water conducts heat about 23 times faster than still air and moving air removes it faster still. Deep cold with dry clothing is often safer, because everyone dresses for it.

What should I do with wet boots overnight while camping?#

Put them in the porch on their side, laces fully loosened, insoles removed and stood separately. Air has to reach the inside, and an upright boot dries only its outer. Keep them away from a stove: adhesives fail and leather shrinks well below the temperature you notice as too hot to touch.

How long can a tent stay packed wet before it is damaged?#

Aim to have it out and drying within 24 hours, and treat 48 hours as the limit. Mould establishes on damp materials in that window, and moisture with warmth accelerates hydrolysis of polyurethane coatings, which makes a flysheet sticky and leaky. The damage is permanent and starts sooner than most assume.