Last spring frost
Apr 7
Frost Dates for Raleigh, IL
First fall frost
Oct 26
Growing season
202 days
Hardiness zone
7a
In an average year around Raleigh, IL, the last spring frost (32°F) is about Apr 7 and the first fall frost is about Oct 26, giving roughly a 202-day growing season. To be safe most years, wait until Mar 21 before setting out tender plants.
Last spring frost
Dates the last frost of spring typically ends. Plant tender crops after the risk has passed for your comfort level.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | May 5 | Apr 19 | Apr 3 |
| Freeze (32°F) | Apr 25 | Apr 7 | Mar 21 |
| Hard (28°F) | Apr 12 | Mar 26 | Mar 7 |
| Severe (24°F) | Mar 30 | Mar 12 | Feb 21 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 5 | Apr 30 | Apr 26 | Apr 23 | Apr 19 | Apr 16 | Apr 13 | Apr 9 | Apr 3 |
| 32°F | Apr 25 | Apr 18 | Apr 14 | Apr 10 | Apr 7 | Apr 3 | Mar 31 | Mar 28 | Mar 21 |
| 28°F | Apr 12 | Apr 5 | Apr 1 | Mar 29 | Mar 26 | Mar 22 | Mar 18 | Mar 14 | Mar 7 |
| 24°F | Mar 30 | Mar 23 | Mar 19 | Mar 16 | Mar 12 | Mar 8 | Mar 5 | Mar 1 | Feb 21 |
| 20°F | Mar 17 | Mar 12 | Mar 8 | Mar 5 | Mar 2 | Feb 28 | Feb 22 | Feb 15 | Feb 8 |
| 16°F | Mar 11 | Mar 4 | Mar 1 | Feb 25 | Feb 19 | Feb 13 | Feb 8 | Feb 3 | Jan 27 |
First fall frost
Dates the first frost of fall typically arrives. Count back by a crop's days-to-maturity to know your planting cutoff.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | Oct 1 | Oct 16 | Oct 28 |
| Freeze (32°F) | Oct 10 | Oct 26 | Nov 8 |
| Hard (28°F) | Oct 23 | Nov 6 | Nov 25 |
| Severe (24°F) | Nov 3 | Nov 19 | Dec 9 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 1 | Oct 7 | Oct 11 | Oct 13 | Oct 16 | Oct 18 | Oct 21 | Oct 24 | Oct 28 |
| 32°F | Oct 10 | Oct 16 | Oct 21 | Oct 23 | Oct 26 | Oct 28 | Oct 31 | Nov 3 | Nov 8 |
| 28°F | Oct 23 | Oct 28 | Nov 1 | Nov 3 | Nov 6 | Nov 10 | Nov 13 | Nov 18 | Nov 25 |
| 24°F | Nov 3 | Nov 8 | Nov 12 | Nov 15 | Nov 19 | Nov 23 | Nov 28 | Dec 2 | Dec 9 |
| 20°F | Nov 13 | Nov 19 | Nov 23 | Nov 28 | Dec 2 | Dec 6 | Dec 11 | Dec 16 | Dec 23 |
| 16°F | Nov 23 | Dec 1 | Dec 5 | Dec 11 | Dec 16 | Dec 21 | Dec 25 | Dec 30 | Jan 6 |
Growing season is measured at 32°F with about 50% probability. Hardiness zone from the 2023 USDA map; frost normals from NOAA 1991-2020.
Where this data comes from
@endif These dates are computed from the nearest official weather station with long-term records: Harrisburg, Il, about 7.8 miles away@if(!empty($station['elevation_ft'])), at 365 ft elevation. The further the station and the greater the elevation difference from your yard, the more your local frost timing can vary.
How we calculate these dates
Frost and freeze dates come from the NOAA 1991–2020 U.S. Climate Normals, the National Oceanic and Atmospheric Administration's 30-year averages for each weather station. A date shown at the 50% level is the median: in half of years the frost falls on or before it. The 10% and 90% columns show the early and late ends of the range, so you can plant on the odds you're comfortable with. These are long-term averages, not a forecast for this year - always check your local outlook before planting.
Source: NOAA National Centers for Environmental Information, 1991–2020 Climate Normals (public domain). Harman is not affiliated with or endorsed by NOAA.
Frequently asked questions
When is the last frost in Raleigh, IL?
On average, the last spring frost (32°F) around Raleigh, IL is about Apr 7. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 21.
When is the first frost in the fall?
The first fall frost around Raleigh, IL typically arrives about Oct 26. Count back by a crop's days to maturity to find the latest date you can plant it.
When can I plant tomatoes and other tender crops?
Tender crops like tomatoes, peppers and basil are damaged by frost, so wait until the last spring frost has passed - around Apr 7 on average, or Mar 21 to be safe most years.
How long is the growing season here?
The frost-free growing season (between the last spring and first fall 32°F frost) is about 202 days in a typical year.
Are these dates a forecast for this year?
No. They are 30-year averages from the NOAA 1991–2020 Climate Normals, not a prediction for the current year. Use them for planning and always check your local weather forecast before planting or protecting crops.
Local weather for 62977 Planting calendar → Illinois frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026