Mapleton, IL frost dates
Last spring frostApr 16median date
First fall frostOct 23median date
Growing season190 daysfrost-free
Hardiness zone6aZone 6a
How Mapleton compares
- In 8 years out of 10, the last spring frost in Mapleton falls between April 2 and May 4, a 32-day window. The first fall frost falls between October 9 and November 3.
- The median last frost is 1 day earlier than the Illinois median of Apr 17.
- Its 190-day growing season is longer than 57% 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 6a median of Apr 29. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 6a chart.
- The weather station records an average of 118 nights a year at or below 32°F.
- Mapleton shares its weather station with Peoria, IL, 14 km away, so the two have the same frost dates.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 2 |
| 50% (median) | April 16 |
| 10% (safe for tender plants) | May 4 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 9 |
| 50% (median) | October 23 |
| 90% (late) | November 3 |
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 Mapleton, IL
Mapleton, IL frost dates — last frost Apr 16, first frost Oct 23, zone 6a. whenisthelastfrost.com
Crop
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Start indoors: Jan 22 to Feb 5Transplant outside: Mar 19 to Apr 2
Start indoors: Feb 5 to Feb 19Transplant outside: Apr 30 to May 14
Start indoors: Feb 5 to Feb 19Transplant outside: Apr 30 to May 14
Start indoors: Feb 19 to Mar 5Transplant outside: Apr 23 to May 7
Start indoors: Feb 19 to Mar 5Transplant outside: Mar 26 to Apr 9Sow outdoors: Mar 19 to Apr 23Plant for fall: Aug 28 to Sep 25
Start indoors: Feb 19 to Mar 5Transplant outside: Mar 19 to Apr 2Sow outdoors: Mar 19 to Apr 2Plant for fall: Aug 14 to Sep 4
Start indoors: Feb 19 to Mar 5Transplant outside: Apr 2 to Apr 16Plant for fall: Jul 17 to Aug 7
Start indoors: Feb 19 to Mar 5Transplant outside: Mar 26 to Apr 9Plant for fall: Jul 17 to Aug 7
Start indoors: Feb 19 to Mar 5Transplant outside: Apr 2 to Apr 16Plant for fall: Jul 17 to Aug 7
Start indoors: Mar 5 to Mar 19Transplant outside: May 7 to May 21Sow outdoors: May 7 to May 21
Start indoors: Mar 5 to Mar 19Transplant outside: Apr 23 to May 7
Sow outdoors: Mar 5 to Mar 26Plant for fall: Jul 31 to Aug 21
Sow outdoors: Mar 5 to Mar 26Plant for fall: Aug 28 to Sep 18
Sow outdoors: Mar 12 to Apr 23Plant for fall: Sep 11 to Oct 2
Start indoors: Mar 19 to Mar 26Transplant outside: Apr 30 to May 7Sow outdoors: Apr 23 to May 7Plant for fall: Aug 7 to Aug 21
Start indoors: Mar 19 to Mar 26Sow outdoors: Apr 23 to May 7Plant for fall: Aug 14 to Aug 28
Start indoors: Mar 19 to Mar 26Sow outdoors: Apr 23 to May 7
Start indoors: Mar 19 to Mar 26Transplant outside: Apr 30 to May 14
Sow outdoors: Mar 26 to Apr 23Plant for fall: Jul 31 to Aug 14
Sow outdoors: Mar 26 to Apr 23Plant for fall: Aug 14 to Aug 28
Sow outdoors: Mar 26 to Apr 16
Sow outdoors: Apr 2 to Apr 30Plant for fall: Aug 14 to Aug 28
Sow outdoors: Apr 2 to Apr 23Plant for fall: Aug 28 to Sep 18
Sow outdoors: Apr 23 to May 14Plant for fall: Aug 7 to Aug 21
Sow outdoors: Apr 23 to May 7
Transplant outside: Apr 30 to May 21
Plant for fall: Oct 9 to Nov 13
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Mapleton, IL
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 22 – Feb 5 | Mar 19 – Apr 2 | — | — |
| Peppers | Feb 5 – Feb 19 | Apr 30 – May 14 | — | — |
| Eggplant | Feb 5 – Feb 19 | Apr 30 – May 14 | — | — |
| Tomatoes | Feb 19 – Mar 5 | Apr 23 – May 7 | — | — |
| Lettuce | Feb 19 – Mar 5 | Mar 26 – Apr 9 | Mar 19 – Apr 23 | Aug 28 – Sep 25 |
| Kale | Feb 19 – Mar 5 | Mar 19 – Apr 2 | Mar 19 – Apr 2 | Aug 14 – Sep 4 |
| Broccoli | Feb 19 – Mar 5 | Apr 2 – Apr 16 | — | Jul 17 – Aug 7 |
| Cabbage | Feb 19 – Mar 5 | Mar 26 – Apr 9 | — | Jul 17 – Aug 7 |
| Cauliflower | Feb 19 – Mar 5 | Apr 2 – Apr 16 | — | Jul 17 – Aug 7 |
| Okra | Mar 5 – Mar 19 | May 7 – May 21 | May 7 – May 21 | — |
| Basil | Mar 5 – Mar 19 | Apr 23 – May 7 | — | — |
| Peas | — | — | Mar 5 – Mar 26 | Jul 31 – Aug 21 |
| Spinach | — | — | Mar 5 – Mar 26 | Aug 28 – Sep 18 |
| Radishes | — | — | Mar 12 – Apr 23 | Sep 11 – Oct 2 |
| Cucumbers | Mar 19 – Mar 26 | Apr 30 – May 7 | Apr 23 – May 7 | Aug 7 – Aug 21 |
| Zucchini & Summer Squash | Mar 19 – Mar 26 | — | Apr 23 – May 7 | Aug 14 – Aug 28 |
| Winter Squash & Pumpkins | Mar 19 – Mar 26 | — | Apr 23 – May 7 | — |
| Melons & Watermelon | Mar 19 – Mar 26 | Apr 30 – May 14 | — | — |
| Carrots | — | — | Mar 26 – Apr 23 | Jul 31 – Aug 14 |
| Beets | — | — | Mar 26 – Apr 23 | Aug 14 – Aug 28 |
| Potatoes | — | — | Mar 26 – Apr 16 | — |
| Swiss Chard | — | — | Apr 2 – Apr 30 | Aug 14 – Aug 28 |
| Cilantro | — | — | Apr 2 – Apr 23 | Aug 28 – Sep 18 |
| Green Beans | — | — | Apr 23 – May 14 | Aug 7 – Aug 21 |
| Sweet Corn | — | — | Apr 23 – May 7 | — |
| Sweet Potatoes | — | Apr 30 – May 21 | — | — |
| Garlic | — | — | — | Oct 9 – Nov 13 |
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 Peoria Gtr Peoria Ap, IL weather station, 7 km away (elevation 650 ft (198 m)).
Frost dates near Mapleton
- Kingston Mines Apr 16 · Oct 23
- Pekin Apr 16 · Oct 23
- Glasford Apr 16 · Oct 23
- Hanna City Apr 16 · Oct 23
- Creve Coeur Apr 16 · Oct 23
- Peoria Apr 16 · Oct 23
- South Pekin Apr 16 · Oct 23
- East Peoria Apr 16 · Oct 23
- Groveland Apr 16 · Oct 23
- Trivoli Apr 16 · Oct 23
Frequently asked questions
When is the last frost in Mapleton, IL?
The median last spring frost in Mapleton, IL is April 16. There is still about a 10% chance of frost after May 4, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Mapleton, IL?
The median first fall frost is October 23, with about a 10% chance of frost before October 9.
How long is the growing season in Mapleton, IL?
About 190 days between the median last spring frost and first fall frost.
What planting zone is Mapleton, IL?
Mapleton, IL is in USDA hardiness zone 6a.