Johnsonville, IL frost dates
Last spring frostApr 9median date
First fall frostOct 24median date
Growing season198 daysfrost-free
Hardiness zone6bZone 6b
How Johnsonville compares
- In 8 years out of 10, the last spring frost in Johnsonville falls between March 29 and April 23, a 25-day window. The first fall frost falls between October 11 and November 6.
- The median last frost is 8 days earlier than the Illinois median of Apr 17.
- Its 198-day growing season is longer than 81% of the 1,287 Illinois places with a regular frost season (state median 187 days).
- The last frost is 13 days earlier than the zone 6b median of Apr 22. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 6b chart.
- The weather station records an average of 109 nights a year at or below 32°F.
- Compared with Evansville, IN, 103 km away, the last frost here is 11 days later than there and the growing season is 28 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 29 |
| 50% (median) | April 9 |
| 10% (safe for tender plants) | April 23 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 11 |
| 50% (median) | October 24 |
| 90% (late) | November 6 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Planting calendar for Johnsonville, IL
Johnsonville, IL frost dates — last frost Apr 9, first frost Oct 24, zone 6b. whenisthelastfrost.com
Crop
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Start indoors: Jan 15 to Jan 29Transplant outside: Mar 12 to Mar 26
Start indoors: Jan 29 to Feb 12Transplant outside: Apr 23 to May 7
Start indoors: Jan 29 to Feb 12Transplant outside: Apr 23 to May 7
Start indoors: Feb 12 to Feb 26Transplant outside: Apr 16 to Apr 30
Start indoors: Feb 12 to Feb 26Transplant outside: Mar 19 to Apr 2Sow outdoors: Mar 12 to Apr 16Plant for fall: Aug 29 to Sep 26
Start indoors: Feb 12 to Feb 26Transplant outside: Mar 12 to Mar 26Sow outdoors: Mar 12 to Mar 26Plant for fall: Aug 15 to Sep 5
Start indoors: Feb 12 to Feb 26Transplant outside: Mar 26 to Apr 9Plant for fall: Jul 18 to Aug 8
Start indoors: Feb 12 to Feb 26Transplant outside: Mar 19 to Apr 2Plant for fall: Jul 18 to Aug 8
Start indoors: Feb 12 to Feb 26Transplant outside: Mar 26 to Apr 9Plant for fall: Jul 18 to Aug 8
Start indoors: Feb 26 to Mar 12Transplant outside: Apr 30 to May 14Sow outdoors: Apr 30 to May 14
Start indoors: Feb 26 to Mar 12Transplant outside: Apr 16 to Apr 30
Sow outdoors: Feb 26 to Mar 19Plant for fall: Aug 1 to Aug 22
Sow outdoors: Feb 26 to Mar 19Plant for fall: Aug 29 to Sep 19
Sow outdoors: Mar 5 to Apr 16Plant for fall: Sep 12 to Oct 3
Start indoors: Mar 12 to Mar 19Transplant outside: Apr 23 to Apr 30Sow outdoors: Apr 16 to Apr 30Plant for fall: Aug 8 to Aug 22
Start indoors: Mar 12 to Mar 19Sow outdoors: Apr 16 to Apr 30Plant for fall: Aug 15 to Aug 29
Start indoors: Mar 12 to Mar 19Sow outdoors: Apr 16 to Apr 30
Start indoors: Mar 12 to Mar 19Transplant outside: Apr 23 to May 7
Sow outdoors: Mar 19 to Apr 16Plant for fall: Aug 1 to Aug 15
Sow outdoors: Mar 19 to Apr 16Plant for fall: Aug 15 to Aug 29
Sow outdoors: Mar 19 to Apr 9
Sow outdoors: Mar 26 to Apr 23Plant for fall: Aug 15 to Aug 29
Sow outdoors: Mar 26 to Apr 16Plant for fall: Aug 29 to Sep 19
Sow outdoors: Apr 16 to May 7Plant for fall: Aug 8 to Aug 22
Sow outdoors: Apr 16 to Apr 30
Transplant outside: Apr 23 to May 14
Plant for fall: Oct 10 to Nov 14
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Johnsonville, IL
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 15 – Jan 29 | Mar 12 – Mar 26 | — | — |
| Peppers | Jan 29 – Feb 12 | Apr 23 – May 7 | — | — |
| Eggplant | Jan 29 – Feb 12 | Apr 23 – May 7 | — | — |
| Tomatoes | Feb 12 – Feb 26 | Apr 16 – Apr 30 | — | — |
| Lettuce | Feb 12 – Feb 26 | Mar 19 – Apr 2 | Mar 12 – Apr 16 | Aug 29 – Sep 26 |
| Kale | Feb 12 – Feb 26 | Mar 12 – Mar 26 | Mar 12 – Mar 26 | Aug 15 – Sep 5 |
| Broccoli | Feb 12 – Feb 26 | Mar 26 – Apr 9 | — | Jul 18 – Aug 8 |
| Cabbage | Feb 12 – Feb 26 | Mar 19 – Apr 2 | — | Jul 18 – Aug 8 |
| Cauliflower | Feb 12 – Feb 26 | Mar 26 – Apr 9 | — | Jul 18 – Aug 8 |
| Okra | Feb 26 – Mar 12 | Apr 30 – May 14 | Apr 30 – May 14 | — |
| Basil | Feb 26 – Mar 12 | Apr 16 – Apr 30 | — | — |
| Peas | — | — | Feb 26 – Mar 19 | Aug 1 – Aug 22 |
| Spinach | — | — | Feb 26 – Mar 19 | Aug 29 – Sep 19 |
| Radishes | — | — | Mar 5 – Apr 16 | Sep 12 – Oct 3 |
| Cucumbers | Mar 12 – Mar 19 | Apr 23 – Apr 30 | Apr 16 – Apr 30 | Aug 8 – Aug 22 |
| Zucchini & Summer Squash | Mar 12 – Mar 19 | — | Apr 16 – Apr 30 | Aug 15 – Aug 29 |
| Winter Squash & Pumpkins | Mar 12 – Mar 19 | — | Apr 16 – Apr 30 | — |
| Melons & Watermelon | Mar 12 – Mar 19 | Apr 23 – May 7 | — | — |
| Carrots | — | — | Mar 19 – Apr 16 | Aug 1 – Aug 15 |
| Beets | — | — | Mar 19 – Apr 16 | Aug 15 – Aug 29 |
| Potatoes | — | — | Mar 19 – Apr 9 | — |
| Swiss Chard | — | — | Mar 26 – Apr 23 | Aug 15 – Aug 29 |
| Cilantro | — | — | Mar 26 – Apr 16 | Aug 29 – Sep 19 |
| Green Beans | — | — | Apr 16 – May 7 | Aug 8 – Aug 22 |
| Sweet Corn | — | — | Apr 16 – Apr 30 | — |
| Sweet Potatoes | — | Apr 23 – May 14 | — | — |
| Garlic | — | — | — | Oct 10 – Nov 14 |
Dates come from the median frost dates and common extension-service timing. Adjust for your soil temperature, microclimate and the varieties you grow.
About these dates
Based on 1991–2020 NOAA climate normals for the Flora, IL weather station, 18 km away (elevation 482 ft (147 m)).
Frost dates near Johnsonville
- Cisne Apr 7 · Oct 26
- Rinard Apr 9 · Oct 24
- Geff Apr 7 · Oct 26
- Sims Apr 7 · Oct 26
- Xenia Apr 10 · Oct 23
- Flora Apr 9 · Oct 24
- Keenes Apr 11 · Oct 22
- Wayne City Apr 7 · Oct 26
- Fairfield Apr 7 · Oct 26
- Iuka Apr 9 · Oct 26
Frequently asked questions
When is the last frost in Johnsonville, IL?
The median last spring frost in Johnsonville, IL is April 9. There is still about a 10% chance of frost after April 23, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Johnsonville, IL?
The median first fall frost is October 24, with about a 10% chance of frost before October 11.
How long is the growing season in Johnsonville, IL?
About 198 days between the median last spring frost and first fall frost.
What planting zone is Johnsonville, IL?
Johnsonville, IL is in USDA hardiness zone 6b.