When Is the First Freeze in Chicago, IL?
Quick Answer
The first freeze in Chicago, IL typically arrives around October 28. There is a 10 percent chance it comes by October 15 and a 90 percent chance it has come by November 11. Finish winterizing outdoor faucets by October 15, and test the furnace by October 1. The average stretch between the last spring freeze and the first fall freeze is 193 days.
Your Chicago winterizing calendar
Every date below is counted back from the earliest realistic freeze, October 15. Work through them in order and the pipes are safe even in an early year. If a date has already passed, do that step this weekend.
By September 17: clear the gutters and seal the gaps
Clean the gutters, caulk the window gaps, and replace a worn door sweep so heat stays in and ice doesn't build at the eaves.
By October 1: test the furnace and swap the filter
Run the heat for ten minutes on a mild day so a dead igniter or a tripped breaker shows up now, not on the first cold night. If it won't start, the furnace checklist covers the free fixes first.
By October 15: pull the hoses and drain the faucets
This is the date that matters. Unscrew every hose, close the indoor shutoff, drain each spigot, and cover it. The full routine is in how to winterize outdoor faucets.
After April 3: reverse it in spring
That is the date by which 90 percent of years have seen their last freeze. Open the indoor shutoff and check the wall behind each spigot for a split pipe before you trust it.
The numbers behind it
| Chance a freeze (32°F or lower) has happened by | First fall freeze | Last spring freeze |
|---|---|---|
| 10 percent (early year) | October 15 | May 1 |
| 50 percent (typical year) | October 28 | April 16 |
| 90 percent (late year) | November 11 | April 3 |
Source: NOAA NCEI U.S. Climate Normals 1991 to 2020, station CHICAGO OHARE INTL AP (ID USW00094846, about 658 feet). The station is usually the airport, so a hilltop or a river valley across town can freeze a week earlier or later. See how Covefix uses this data.
FAQ
When is the first freeze in Chicago, IL?
The typical first freeze in Chicago, IL falls around October 28. There is a 10 percent chance it arrives by October 15 and a 90 percent chance it has arrived by November 11, based on NOAA 1991 to 2020 climate normals for the CHICAGO OHARE INTL AP station.
When should I winterize outdoor faucets in Chicago?
Finish by October 15. That is the earliest date a freeze has even a 10 percent chance of having already happened in Chicago, so disconnecting hoses, draining the spigots, and fitting covers before then protects the pipes in all but the earliest years.
When is the last frost in Chicago, IL?
The typical last spring freeze in Chicago, IL is around April 16. Wait until after April 3, the 90 percent date, before reversing winterizing steps like re-opening an outdoor shutoff.
Guides for this season
Outdoors & Seasonal
How to Clean Gutters Without Falling Off the Ladder
Clogged gutters dump water at your foundation. Here is the safe ladder setup, the scoop-and-flush method, and the downspout test most people skip.
Time2–4 hrs Cost$0–$60 moderate
Outdoors & Seasonal
Fix a Drafty Door in an Hour (Weatherstripping That Lasts)
That draft under the front door costs real heating and AC money. Find the gaps with a flashlight, then seal them with $15 of weatherstripping and a sweep.
Time45–60 min Cost$10–$25 easy
Heating & Cooling
Furnace Not Turning On: 7 Checks Before You Call for Service
A furnace that won't start is usually a thermostat setting, tripped breaker, power switch, clogged filter, or loose blower door. Check those five first.
Time15–45 min Cost$0–$25 moderate
Heating & Cooling
How to Replace an HVAC Filter the Right Way
A dirty HVAC filter cuts airflow and raises bills. Find the size, point the arrow toward the unit, and replace it in under 10 minutes today.
Time5–10 min Cost$8–$25 easy
Outdoors & Seasonal
Seal Drafty Windows Before the First Cold Snap
Find the leak with a smoking incense stick, then match the fix to the gap. And never caulk the weep holes at the bottom of a vinyl window frame.
Time30 min–2 hrs Cost$10–$45 easy
Outdoors & Seasonal
How to Winterize Outdoor Faucets Before the First Freeze
Pull the hose, close the indoor shutoff, drain the spigot, and cover it. 15 minutes per faucet in October prevents a burst pipe in the wall in January.
Time15 min per faucet Cost$0–$15 easy
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