It is the first cold morning after a wet day. You press the button, the opener hums and strains, and the door does not move. Or it jerks up an inch and stops. In Massachusetts that is usually ice: meltwater or rain pooled at the base of the door overnight, froze, and glued the rubber bottom seal to the concrete.

The good news is that a door frozen to the floor is one of the few garage door problems you can fix yourself in a few minutes. The bad news is that the two most common reactions, pressing the button again and pouring hot water on it, are the ones that turn a free fix into a repair.

First, stop pressing the button

Each press sends the opener against a door that cannot move. On a chain or belt opener that strips the drive gear or trips the motor's thermal cutoff; on any opener it can pull the arm bracket loose from the top panel. Two tries is enough to know the door is stuck. After that, every press is wear with no chance of success.

If the opener did manage to pull the door up and you heard a tearing sound, the ice won and the seal lost. The door will work, but check the bottom seal once it is open (see "After it is free" below).

Make sure it is ice

Before you start chipping, confirm the door is actually frozen and not broken. A frozen door and a broken spring both leave you pressing a button while nothing happens, but the fixes are opposite.

  • Look at the bottom edge. Ice, frost or frozen slush along the seal means ice. A clean dry seal with a cold door means look elsewhere.
  • Look up at the springs above the door (torsion springs on a shaft) or along the tracks (extension springs). A gap of an inch or two in a torsion spring's coils means it snapped. Stop here, leave the door closed, and read how to tell if your garage door spring is broken. Do not pull the red release cord on a door with a broken spring.
  • Look at the cables on each side. A slack or unwound cable, or a door that sits crooked, is a cable problem, not ice.
  • Check the lock. A manual slide lock on the inside of the door, or the "lock" or "vacation" button on the wall console, will stop the door exactly like ice does.

If the springs and cables look right and there is ice along the bottom, carry on.

How to free a frozen garage door

  1. Work from inside if you can. Walk in through the house or a side door. The ice is easier to see and reach from inside, and you are not standing where the door will come down.
  2. Break the bond along the whole length. Slide a plastic ice scraper, a stiff putty knife or the edge of a flat shovel between the seal and the floor and work from one side to the other. The goal is to separate the rubber from the concrete, not to chip away a block of ice. Keep the blade flat against the floor so you do not cut the seal.
  3. Soften stubborn spots with warm air, not water. A hair dryer or heat gun on low, moved along the seal, melts the bond in a minute or two. Hot water refreezes within minutes and often spreads into a wider sheet than you started with. Rock salt and ice-melt chemicals eat the rubber seal and the galvanizing on the bottom bracket.
  4. Try the door by hand once it is loose. With the door fully closed, pull the red release cord so the door is disconnected from the opener, then lift the door a few inches with the handle. If it moves, it is free. If it feels like you are lifting the full weight of the door, lower it gently and stop: the problem is a spring, not ice.
  5. Reconnect the opener and run it once. Pull the release cord toward the door (or run the opener; most reconnect themselves on the next cycle) and let the door complete a full open and close.

Never pry upward at the bottom panel with a bar or a shovel blade. The bottom section is the one that carries the lift cable brackets, and bending its lip or the seal retainer is a panel repair on a door that was fine ten minutes ago. Never try to break the door free with the car or by hanging your weight on the handle.

After it is free

  • Check the bottom seal. If the rubber is torn, flattened, or pulled out of its track, the door will freeze again on the next wet cold night, and it will also let water, wind and mice in. The bottom seal is a separate part and can be replaced on its own; see weatherstripping replacement.
  • Clear the water and slush in front of the door and inside along the threshold so it has nothing to refreeze with.
  • Listen to the opener on the next few cycles. A new grinding or a motor that runs without moving the door after a frozen morning usually means the drive gear was stripped while the door was stuck. That is an opener repair, and a common one in January.

Why it keeps happening to the same doors

A door that freezes shut every cold snap has a reason, and it is rarely the weather alone.

  • Water pools at the door. A driveway that slopes toward the garage, a gutter that drains beside the door, or a dip in the slab under the seal leaves standing water exactly where it will freeze. Watch where the water sits after the next rain.
  • The seal is hard or worn. Old rubber goes stiff, stops following the floor, and holds a film of water that bonds. A fresh, flexible seal sheds water and releases more easily.
  • Snow is left against the door. Melt during the day, freeze overnight. Shovel to the door, not just to the car.
  • The garage is damp. Snow melting off a car inside the garage runs to the door and refreezes at the seal. A drain mat under the car or a squeegee to the floor drain helps.

Keeping it from freezing

  • Before a wet day that turns cold, run a silicone spray along the bottom seal. Silicone keeps water from bonding to the rubber. Use silicone, not petroleum products, which swell and soften the seal.
  • Keep snow and standing water cleared from the threshold on both sides.
  • Replace a cracked, hard or torn bottom seal in the fall rather than in January. The fall is also when to check the side and top seals; the cold-weather guide covers the full pre-winter list.
  • If the slab has a low spot under the door, a threshold seal glued to the floor fills it and gives the bottom seal something flat to close against.

When to call

Call rather than keep working if any of these is true:

  • The door will not lift by hand once it is free of ice, or feels very heavy. That is a spring, and it needs spring replacement, not more effort.
  • The door went up crooked, or a cable is hanging loose.
  • The opener runs but the door does not move after the ice is gone.
  • The bottom seal came out of its retainer or the retainer itself is bent.
  • The car is trapped and you need to get out. That is an emergency garage door repair call; the page lists the hours and what an emergency visit costs.

A garage door that froze shut once is a normal Massachusetts winter morning. One that freezes shut every week is telling you about the seal or the drainage, and both are small jobs when they are done before the next freeze.

Want the seal, balance and opener checked before the first hard freeze? Book a tune-up online. If the door is stuck right now and you are out of ideas, see emergency garage door repair.