Frost dates for West Chicago Dupage Airport, IL
At West Chicago Dupage Airport, the median last spring frost (32°F) is Apr 25 and the median first fall frost is Oct 19, for a typical growing season of 174 days. For a 90% chance that the last frost has passed, wait until May 12. Nearby ZIP codes are in USDA hardiness zone 5b.
- Apr 25Last spring frost (median)50% chance of 32°F after this date
- May 12Safer planting date10% chance of 32°F after this date
- Oct 19First fall frost (median)50% chance of 32°F by this date
- 174 daysGrowing season (median)between 32°F freezes
Last spring frost dates
The chance that the temperature drops to the threshold after each date.
| Temperature | 90% chance later | 50% chance later | 10% chance later |
|---|---|---|---|
| 36°F | Apr 23 | May 6 | May 24 |
| 32°F | Apr 11 | Apr 25 | May 12 |
| 28°F | Mar 31 | Apr 14 | Apr 29 |
| 24°F | Mar 17 | Apr 2 | Apr 18 |
First fall frost dates
The chance that the temperature has dropped to the threshold by each date.
| Temperature | 10% chance by | 50% chance by | 90% chance by |
|---|---|---|---|
| 36°F | Sep 25 | Oct 7 | Oct 20 |
| 32°F | Oct 5 | Oct 19 | Oct 30 |
| 28°F | Oct 16 | Oct 29 | Nov 12 |
| 24°F | Oct 28 | Nov 9 | Nov 25 |
Growing season length
Days between the last spring and first fall freeze, as the length reached in 9, 5 and 1 out of 10 years.
| Temperature | 9 in 10 years at least | 5 in 10 years at least | 1 in 10 years at least |
|---|---|---|---|
| 36°F | 133 days | 153 days | 173 days |
| 32°F | 153 days | 174 days | 194 days |
| 28°F | 176 days | 197 days | 216 days |
| 24°F | 201 days | 221 days | 243 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 60185 | 5b | -15 to -10°F | 4 km |
| 60184 | 5b | -15 to -10°F | 4 km |
| 60174 | 5b | -15 to -10°F | 5 km |
| 60190 | 5b | -15 to -10°F | 9 km |
| 60134 | 5b | -15 to -10°F | 9 km |
| 60188 | 5b | -15 to -10°F | 10 km |
| 60175 | 5b | -15 to -10°F | 12 km |
| 60183 | 5b | -15 to -10°F | 14 km |
Not the official USDA Plant Hardiness Zone Map. Zones shown here are the values published in the USDA-ARS / Oregon State University PRISM Group 2023 ZIP code tables, shown unaltered. For the official interactive map, visit planthardiness.ars.usda.gov.
About this station
- NOAA station ID USW00094892, at 41.9144, -88.2464, elevation 230 m (754 ft).
- Data quality: Representative (10+ years), 22 years of freeze data.
- Average days per year at or below 32°F: 134.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Streamwood (14 km)
- Aurora (16 km)
- Elgin (17 km)
- Lisle-Morton Arboretum (18 km)
- Wheaton 3 SE (18 km)
- Barrington 3sw (23 km)
- Chicago Aurora Muni Airport (25 km)
- Chicago Ohare Intl Airport (27 km)
Sources
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.
- USDA Agricultural Research Service and PRISM Group, Oregon State University, 2023 Plant Hardiness Zone Map ZIP code tables (CONUS, Alaska, Hawaii, Puerto Rico), files dated November 17, 2023. Data © PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed November 1, 2026. Official map: planthardiness.ars.usda.gov.
- U.S. Census Bureau, 2024 Gazetteer ZIP Code Tabulation Areas file, dated August 30, 2024 (ZIP centroids used to find the nearest station).
Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.