Frost dates for Greenville, IL
When the last spring frost and first fall frost usually come, and when to plant, from 30 years of NOAA weather records.
Last spring frost
April 10
typical year
Safe to plant
April 24
frost is over in 9 of 10 years
First fall frost
October 24
typical year
Growing season
196 days
frost-free, typical year
Frost watch this week
Tonight's and the next six nights' lows from the National Weather Service forecast for the station's location. Frost: 32°F or colder. Possible frost: 33–36°F, mostly in low spots on clear, still nights.
When to plant
Counted from this page's frost dates. Warm-season crops wait for the safe-to-plant date.
| Crop | Start indoors | Plant outside | Fall planting |
|---|---|---|---|
| Cool-season crops | |||
| Peas | – | Mar 13 – 27 | – |
| Spinach | – | Feb 27 – Mar 20 | Aug 29 – Sep 12 |
| Lettuce | – | Mar 13 – Apr 3 | Aug 29 – Sep 12 |
| Radishes | – | Mar 13 – Apr 24 | Sep 12 – 26 |
| Onions | – | Mar 13 – 27 | – |
| Potatoes | – | Mar 20 – Apr 3 | – |
| Carrots | – | Mar 20 – Apr 10 | Aug 1 – 15 |
| Beets | – | Mar 13 – 27 | Aug 15 – 29 |
| Kale | Jan 30 – Feb 13 | Mar 13 – 27 | Aug 15 – 29 |
| Broccoli | Jan 30 – Feb 13 | Mar 27 – Apr 10 | Aug 15 – 29 |
| Cabbage | Jan 16 – 30 | Mar 13 – 27 | Aug 15 – 29 |
| Garlic | – | – | Sep 12 – Oct 3 |
| Warm-season crops | |||
| Tomatoes | Feb 27 – Mar 13 | Apr 24 – May 8 | – |
| Peppers | Feb 20 – Mar 6 | May 1 – 15 | – |
| Cucumbers | – | Apr 24 – May 15 | – |
| Zucchini | – | Apr 24 – May 22 | – |
| Pumpkins | – | Apr 24 – May 15 | – |
| Green beans | – | Apr 24 – Aug 15 | – |
| Sweet corn | – | Apr 24 – May 22 | – |
| Basil | Mar 20 – Apr 3 | May 1 – 8 | – |
Onions: from sets. Green beans: until 10 weeks before the first fall frost. Garlic: harvest next summer.
The year at a glance
Start indoors Plant outside Fall planting
The chance of frost, by date
| 1 year in 10 | Half of years | 9 years in 10 | |
|---|---|---|---|
| Spring frost after | April 24 | April 10 | March 28 |
| Fall frost before | October 11 | October 24 | November 5 |
Frost here means 32°F or colder. Read across: in 1 year in 10, spring frost carries on past the first date, which is why that date is the safe-to-plant date.
Hard freeze (28°F)
A hard freeze kills most garden plants, even hardy ones. The last one in spring usually comes around March 31 (April 16 in a late year), and the first one in fall around November 3.
Towns that use these dates
This is the nearest NOAA station with frost records for 5 towns.
Greenville, Vandalia, Mulberry Grove, Smithboro, Vernon
Where these dates come from
NOAA weather station VANDALIA, IL US (USC00118781), 1991–2020 climate normals. It's the nearest station for 6 zip codes, all within 18 miles:
62246, 62262, 62284, 62471, 62885, 62892
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.