Water Is Coming Under My Garage Door
Noticing water coming under your garage door is frustrating, and in Northern Colorado it can become a repeat problem during heavy rain, snowmelt, or freeze-thaw cycles. Beyond wet boxes and ruined storage, persistent moisture can contribute to musty odors, mold, and long-term damage around the garage entry.
This guide covers the most common reasons a garage door leaks at the bottom, what you can safely check yourself, and when it makes sense to call Jim Beam’s Garage Doors for help in Fort Collins and surrounding areas.
Quick Checklist: What to Check First
- Bottom seal/weatherstripping: cracked, flattened, missing sections
- Threshold/driveway edge: low spots, gaps, or water pooling
- Drainage: gutters, downspouts, grading, and runoff direction
- Door alignment: uneven door, gaps at corners, track issues
1) Worn or Improper Garage Door Bottom Seal
The most common reason water seeps under a garage door is a failing garage door bottom seal (also called weatherstripping). Over time, the seal can crack, compress, or pull away from the retainer, leaving a channel for rainwater and melting snow to enter.
What to look for
- Visible cracks or missing pieces
- Seal is flattened and no longer contacts the floor evenly
- Daylight visible under the door when closed
In winter, bottom seals can also freeze to the concrete, creating gaps once the door cycles. If water and cold-weather problems are happening together, see Common Fall and Winter Garage Door Repair Issues and Regular Winter Maintenance for Garage Doors. If you want a professional fix that holds up, book garage door servicing so we can inspect the seal, door alignment, and closing pressure in one visit.
2) Uneven Garage Floor or Low Spots at the Threshold
An uneven garage floor or a low spot right at the opening can allow water to collect and push under the door. This is common when the slab has settled over time or when the driveway edge is slightly higher than the garage floor. If you’re also noticing the door closing unevenly, a mechanical issue may be contributing. Start here: Signs That Your Garage Is Off Track.
Solutions that work
- Threshold seal: adds a raised barrier at the base to block minor runoff
- Concrete sealing: helps reduce absorption and moisture wicking
- Spot leveling: addresses low areas that collect water
3) Poor Drainage Outside the Garage
If water pools near the garage, it will eventually find a path inside. Many “leaking garage door” problems are actually drainage problems. For broader weather protection steps, see: Weatherproofing Your Garage Tips.
What to check outside
- Does the ground slope away from the garage?
- Do downspouts dump water near the garage door?
- Are gutters overflowing during storms?
- Is snowmelt running down the driveway and collecting at the door?
4) Damaged or Misaligned Garage Door Creating Gaps
A garage door that’s bent, misaligned, or closing unevenly can create small gaps at the corners or along the bottom seal. Even a minor gap is enough for wind-driven rain or melting snow to enter.
Common causes
- Track alignment issues
- Worn rollers or hardware that allows the door to “rack”
- Settling that changes how the door meets the floor
- Damaged panels affecting how the door seats
If the door needs repair, start with garage door repair. If the door is older or significantly damaged, it may be smarter to replace it. See our garage door installation options.
Other Reasons Water Might Be in Your Garage
- Broken Plumbing or Leaky Appliances – If puddles form when it hasn’t rained, the source might be inside the garage. Check for leaking fittings, nearby appliances, or water lines.
- Cracked or Pitted Concrete Floors – Moisture can wick through cracks or porous concrete, especially during long wet periods. If water seems to be coming up from the slab, a concrete professional may be needed.
- Window and Exterior Door Seams – Water can enter through poorly sealed windows or side doors and run across the floor toward the garage opening. Look for water beading around frames and recaulk if needed.
- Sloped Driveway Directing Runoff Toward the Door – If the driveway slopes into the garage, water will naturally flow to the opening. Drainage improvements are usually the long-term fix.
- Dryer Condensation – If you have a dryer in the garage and the venting is poor, condensation can collect and mimic a leak. Check vent routing and look for moisture on windows after running the dryer.
- Clogged Gutters – Overflowing gutters can dump water right where you don’t want it: along the garage front edge. Cleanouts and downspout extensions can make a noticeable difference.
When to Call a Pro
If you’ve replaced the bottom seal and addressed obvious drainage, but you still see water coming under the door, the problem is often door alignment, track position, or a fit issue that needs a technician’s eye. Forcing adjustments can create bigger issues (and sometimes causes the door to stop closing properly). If your door is also refusing to close consistently, reference: Why Won’t My Garage Door Close? and Why Does My Garage Door Reverse Automatically After Closing?
Garage Door Repair & Weather Sealing in Fort Collins
Jim Beam’s Garage Doors helps homeowners across Fort Collins and Northern Colorado stop water intrusion at the garage entry with practical, durable fixes. If you need fast help, request service here: Contact Jim Beam’s Garage Doors. Need urgent help? Visit our 24/7 Garage Door Emergency Services page.
Frequently Asked Questions
Why is water coming under my garage door when it rains?
The most common causes are a worn bottom seal/weatherstripping, water pooling near the threshold, poor drainage, or a door that isn’t sealing evenly due to alignment or track issues.
What’s the best way to stop water from coming under a garage door?
Start with the bottom seal and drainage. If the slab is uneven, a threshold seal can help. If the door is misaligned or damaged, professional repair is usually needed for a lasting fix.
Can a garage door be “too high” off the ground?
Yes. If there’s a visible gap under the door, water and pests can enter. A technician can evaluate the seal, door fit, and track alignment to improve closure at the floor.
Is this a winter issue in Northern Colorado?
Often, yes. Snowmelt, ice buildup, and freeze-thaw cycles can make small gaps worse. Winter maintenance and weatherproofing reduce repeat problems. See Regular Winter Maintenance for Garage Doors.
Who should I call for help in Fort Collins?
If you want a professional diagnosis and a fix that lasts, contact
Jim Beam’s Garage Doors for repair, servicing, or replacement options.
