Frost dates for Chicago Northerly Island, IL
At Chicago Northerly Island, the median last spring frost (32°F) is Apr 10 and the median first fall frost is Nov 5, for a typical growing season of 208 days. For a 90% chance that the last frost has passed, wait until Apr 25. Nearby ZIP codes are in USDA hardiness zones 6a to 6b.
- Apr 10Last spring frost (median)50% chance of 32°F after this date
- Apr 25Safer planting date10% chance of 32°F after this date
- Nov 5First fall frost (median)50% chance of 32°F by this date
- 208 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 9 | Apr 23 | May 9 |
| 32°F | Mar 29 | Apr 10 | Apr 25 |
| 28°F | Mar 16 | Apr 1 | Apr 14 |
| 24°F | Mar 5 | Mar 19 | Apr 3 |
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 | Oct 12 | Oct 26 | Nov 7 |
| 32°F | Oct 24 | Nov 5 | Nov 20 |
| 28°F | Nov 2 | Nov 15 | Dec 1 |
| 24°F | Nov 9 | Nov 24 | Dec 10 |
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 | 165 days | 185 days | 205 days |
| 32°F | 187 days | 208 days | 229 days |
| 28°F | 210 days | 229 days | 250 days |
| 24°F | 228 days | 249 days | 272 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 |
|---|---|---|---|
| 60605 | 6b | -5 to 0°F | 1 km |
| 60616 | 6b | -5 to 0°F | 2 km |
| 60601 | 6b | -5 to 0°F | 3 km |
| 60602 | 6b | -5 to 0°F | 3 km |
| 60653 | 6b | -5 to 0°F | 4 km |
| 60661 | 6b | -5 to 0°F | 4 km |
| 60607 | 6b | -5 to 0°F | 4 km |
| 60611 | 6b | -5 to 0°F | 4 km |
| 60654 | 6b | -5 to 0°F | 5 km |
| 60608 | 6a | -10 to -5°F | 5 km |
| 60610 | 6b | -5 to 0°F | 6 km |
| 60615 | 6b | -5 to 0°F | 6 km |
| 60609 | 6a | -10 to -5°F | 6 km |
| 60642 | 6a | -10 to -5°F | 7 km |
| 60612 | 6a | -10 to -5°F | 7 km |
| 60622 | 6a | -10 to -5°F | 8 km |
| 60614 | 6b | -5 to 0°F | 8 km |
| 60637 | 6a | -10 to -5°F | 8 km |
| 60621 | 6a | -10 to -5°F | 9 km |
| 60657 | 6a | -10 to -5°F | 10 km |
| 60624 | 6a | -10 to -5°F | 10 km |
| 60647 | 6a | -10 to -5°F | 11 km |
| 60649 | 6b | -5 to 0°F | 12 km |
| 60613 | 6b | -5 to 0°F | 12 km |
| 60651 | 6a | -10 to -5°F | 12 km |
| 60619 | 6a | -10 to -5°F | 12 km |
| 60618 | 6a | -10 to -5°F | 13 km |
| 60640 | 6a | -10 to -5°F | 14 km |
| 60639 | 6a | -10 to -5°F | 14 km |
| 60625 | 6a | -10 to -5°F | 15 km |
| 60641 | 6a | -10 to -5°F | 15 km |
| 60660 | 6a | -10 to -5°F | 16 km |
| 60617 | 6a | -10 to -5°F | 16 km |
| 60659 | 6a | -10 to -5°F | 17 km |
| 46394 | 6a | -10 to -5°F | 21 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 USC00111550, at 41.8558, -87.6094, elevation 178 m (583 ft).
- Data quality: Representative (10+ years), 15 years of freeze data.
- Average days per year at or below 32°F: 96.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Chicago Midway Airport (14 km)
- Chicago Midway Airport 3sw (19 km)
- Little Red School Hse (27 km)
- Chicago Ohare Intl Airport (31 km)
- Chicago Botanic Garden (35 km)
- Chicago Palwaukee Airport (38 km)
- Lisle-Morton Arboretum (39 km)
- Wheaton 3 SE (39 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.