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Will it freeze in Blue Island in the next 7 nights?
No overnight lows at or below 32°F are forecast in Blue Island during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 40°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 6:00 PM CST to Fri, Nov 6, 6:00 AM CST.
2 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 40°F Above 36°F · Chance Rain Showers then Mostly Cloudy
- Fri, Nov 6 36°F Frost possible · Partly Cloudy
- Sat, Nov 7 36°F Frost possible · Mostly Clear
- Sun, Nov 8 38°F Above 36°F · Mostly Clear
- Mon, Nov 9 43°F Above 36°F · Mostly Clear
- Tue, Nov 10 41°F Above 36°F · Partly Cloudy
- Wed, Nov 11 41°F Above 36°F · Partly Cloudy
Overnight lows from the National Weather Service forecast for this location. This covers the available forecast window, not the first freeze of the whole season. Frost can form above 32°F on clear, calm nights.
Frost and freeze probabilities
Freeze dates shift from year to year. Spring percentages describe the chance of a freeze after the stated date; fall percentages describe the chance of a freeze by that date. The 10% spring date is the cautious one: a later freeze happens about 1 year in 10.
These dates describe historical probabilities, not this year’s forecast or the earliest and latest possible freezes. Different weather stations or probability thresholds can produce different published dates for the same city.
Average first hard freeze in Blue Island
The median first fall hard-freeze date (28°F) is November 11, from NOAA’s 1991–2020 Climate Normals at Chicago Midway Airport 3SW. This is the 50% probability date, not a forecast for this year.
| Temperature | Last spring date 90% · 50% · 10% chance of a later freeze | First fall date 10% · 50% · 90% chance of an earlier freeze | Season |
|---|---|---|---|
| 36°F frost possible | Apr 9 · Apr 22 · May 6 | Oct 10 · Oct 22 · Nov 3 | 181 days |
| 32°F freeze | Mar 30 · Apr 10 · Apr 26 | Oct 21 · Nov 1 · Nov 16 | 203 days |
| 28°F hard freeze | Mar 15 · Apr 1 · Apr 14 | Oct 30 · Nov 11 · Nov 26 | 225 days |
Average high temperature by month
1991–2020 normals at Chicago Midway Airport 3SW
Average low temperature by month
Months with lows near or below freezing carry frost risk
Where these frost dates come from
The frost dates for Blue Island, IL come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Chicago Midway Airport 3SW (station USC00111577, elevation 620 ft), 7.4 mi from Blue Island. Local conditions (valleys, hilltops, distance to water, city heat) can shift frost dates by days or weeks. The hardiness zone is from the 2023 USDA Plant Hardiness Zone Map (USDA ARS and Oregon State University PRISM). See our methodology.
Frost dates near Blue Island
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Calumet Park, IL | 1.2 mi | Apr 10 | Nov 1 |
| Posen, IL | 1.9 mi | Apr 10 | Nov 1 |
| Riverdale, IL | 2.5 mi | Apr 10 | Nov 1 |
| Alsip, IL | 3.1 mi | Apr 10 | Nov 1 |
| Midlothian, IL | 3.1 mi | Apr 10 | Nov 1 |
| Crestwood, IL | 3.1 mi | Apr 10 | Nov 1 |
| Harvey, IL | 3.7 mi | Apr 23 | Oct 20 |
| Markham, IL | 3.7 mi | Apr 23 | Oct 20 |
| Evergreen Park, IL | 4.3 mi | Apr 10 | Nov 1 |
| Dolton, IL | 5.0 mi | Apr 23 | Oct 20 |
Frequently asked questions
When is the last frost in Blue Island?
On average, the last spring frost (32°F) in Blue Island is around April 10. In about 1 year in 10 it comes after April 26, and in 9 years in 10 it comes after March 30.
When is the first frost in Blue Island?
The first fall frost (32°F) usually arrives around November 1. There’s a 10% chance of a freeze by October 21 and a 90% chance by November 16.
Can it frost in Blue Island after the last frost date?
Yes. Frost can form on clear, calm nights even when the air stays above 32°F. Temperatures of 36°F or lower, cold enough for frost on exposed plants, have a 50% chance of occurring after April 22.
What growing zone is Blue Island?
Blue Island is in USDA Plant Hardiness Zone 6a (average annual extreme minimum temperature −10 to −5°F), based on the 2023 USDA map for ZIP code 60406. See growing zones in Illinois.
More: all Illinois frost dates · Illinois growing zones · frost vs. freeze