How does extreme cold work in D&D 5e?

Extreme cold is an environmental hazard: a creature exposed to temperatures at or below freezing must make a Constitution saving throw each hour or gain one level of exhaustion. Creatures with cold resistance or immunity, or with appropriate cold weather gear, are unaffected.

How does exhaustion work in the 2024 rules?

The 2024 rules replaced the six-tier table of specific penalties with a simpler cumulative system: each level of exhaustion applies a penalty to d20 tests and reduces speed, and death still occurs at level six. It is easier to run and less punishing at low levels than the 2014 version.

Do cold weather clothes stop extreme cold damage?

Yes. Appropriate cold weather gear removes the hourly saving throw entirely under the standard rules. That is what makes the gear a meaningful purchase — the rule exists to make the party plan, not to punish them for being outside.

Does swimming in cold water cause exhaustion?

Frigid water is handled separately. A creature can be immersed for a number of minutes equal to its Constitution score before it must start making Constitution saves against exhaustion, which makes falling through ice genuinely dangerous without being instantly fatal.

How often should I roll for cold weather?

At decision points, not on a timer. Roll when the party travels overland, sleeps without proper shelter, or fights outdoors for an extended time. Rolling every hour of in-game time turns the setting into paperwork and stops players engaging with it.

What about slippery ice and heavy snow?

Ice is difficult terrain and can require an Acrobatics check to move at full speed without falling prone. Heavy snow likewise halves travel pace. Used sparingly in a single fight, both add real tactical texture; applied constantly they become a tax.

Cold weather and survival rules in D&D 5e

TL;DR: Extreme cold means an hourly Constitution save or a level of exhaustion, negated by proper cold weather gear. Frigid water gives you minutes equal to your Constitution before saves begin. The 2024 exhaustion rules are simpler and less brutal. Roll at decision points — travel, shelter, long fights outdoors — not on a clock, or the cold becomes admin instead of atmosphere.

A frozen campaign lives or dies on one judgement call: how often you make the party roll.

Roll too much and extreme cold becomes a spreadsheet. Roll never and the setting is a snow-coloured version of anywhere else. The rules themselves are short and reasonable — most of the work is knowing when to invoke them.

The core rules, briefly

Extreme cold. A creature exposed to temperatures at or below freezing must succeed on a Constitution saving throw at the end of each hour or gain one level of exhaustion. Creatures with cold resistance or immunity are exempt, as are those wearing appropriate cold weather gear.

That last clause is the important one. The rule is not there to grind hit points off the party. It exists to make preparation matter — to convert “we head north” into a shopping trip, a decision about weight, and a conversation about who is not properly equipped.

Frigid water. Immersion is handled separately and more generously: a creature can be immersed for a number of minutes equal to its Constitution score before it must start rolling Constitution saves against exhaustion. Falling through ice is dangerous but survivable, which is exactly right for a dramatic beat.

Terrain. Ice is difficult terrain, and moving at full speed across it can call for an Acrobatics check or you fall prone. Heavy snow slows overland travel. Both are excellent in one fight and tedious in every fight.

Exhaustion, and why the edition matters

The exhaustion rules changed between rulesets, and it changes how survivable a cold campaign is.

The 2014 version is a six-tier table with distinct penalties per level: disadvantage on ability checks, halved speed, disadvantage on attacks and saves, halved hit point maximum, speed zero, then death. It is harsh and it stacks in ways that are hard to recover from at low levels.

The 2024 version is cumulative and simpler: each level applies a penalty to d20 tests and reduces speed, with death still at level six. It is easier to track and considerably kinder to a level 2 party caught out overnight.

If you are running a survival campaign under the 2014 rules, be aware that two levels of exhaustion on a level 3 character is close to a spiral. Our 2014 versus 2024 comparison covers the broader differences.

When to actually roll

This is the whole craft of it. Roll at decision points:

Overland travel without adequate gear. One roll per day of travel, not per hour.
A night without proper shelter. The party failed to find the cave, or chose to push on.
A fight that runs long outdoors in genuine cold. Mention it as the fight extends, then roll.
Immersion. Falling through ice, crossing a river, being submerged.

Do not roll for:

Walking between two buildings in a town.
Any time the party is properly equipped and indoors or sheltered.
Every hour of a journey you are narrating in a paragraph.

The test is simple: if the roll cannot change a decision, it is paperwork.

Making cold feel cold without rules

Half the atmosphere comes from description, and it is free.

Consume things. Firewood, lamp oil, rations, dry socks. A resource that visibly depletes does more work than any saving throw. Let the party track it loosely and mention when it is low.

Make warmth a place. A tavern with a fire, a hot meal, a bed. Contrast is what makes cold register — a campaign where everything is grey has no cold in it, only greyness.

Describe cost, not temperature. Not “it is very cold” but “your fingers have stopped working properly and you have to hold the rope in both hands.” Specific physical consequence beats an adjective.

Let NPCs be worse off. A village rationing fuel says more about the winter than a blizzard does.

Gear and the shopping trip

Cold weather gear negating the hourly save makes the equipment list interesting for once. Furs, tents, oil, rope that will not freeze solid, snowshoes. This is one of the few times a 5e party genuinely engages with mundane equipment, and it is worth running the shopping scene properly rather than hand-waving it.

Weight matters here too. A party that buys everything discovers that carrying it is its own problem, and that trade-off is good play.

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Weather as a generator, not a mood

The other lever is variable weather. A campaign where every day is “cold” flattens quickly; one where the party checks the sky before deciding to travel has real texture.

The free travel and weather tool will roll conditions for you, which is worth doing rather than deciding — a DM choosing the weather unconsciously chooses convenient weather, and a random blizzard on the day the party planned to cross the pass produces better play than anything you would have written.

Where this shows up

The obvious home is Rime of the Frostmaiden, where the entire campaign premise is a valley under permanent winter. But the same rules make a single arctic arc work in any campaign — a mountain crossing, a northern expedition, a winter siege.

They also pair naturally with hex travel and overland movement if your campaign has a wilderness phase, and with arctic and snow battlemaps for the fights that happen out in it.

The one-line version

Cold weather rules exist to make the party prepare. Make them roll where preparation would have mattered, describe the cost in specifics rather than adjectives, and put a fire somewhere they can reach.