Frost dates for 60175 — Saint Charles, IL
Last spring frostApr 25median date
First fall frostOct 19median date
Growing season177 daysfrost-free
Hardiness zone5bZone 5b
How Saint Charles compares
- In 8 years out of 10, the last spring frost in Saint Charles falls between April 11 and May 12, a 31-day window. The first fall frost falls between October 5 and October 30.
- The median last frost is 8 days later than the Illinois median of Apr 17.
- Its 177-day growing season is longer than 21% of the 1,287 Illinois places with a regular frost season (state median 187 days).
- The last frost is 6 days earlier than the zone 5b median of May 1. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 5b chart.
- The weather station records an average of 134 nights a year at or below 32°F.
- Compared with Elgin, IL, 13 km away, the last frost here is 1 day earlier than there and the growing season is 2 days longer.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 11 |
| 50% (median) | April 25 |
| 10% (safe for tender plants) | May 12 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 5 |
| 50% (median) | October 19 |
| 90% (late) | October 30 |
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 Saint Charles, IL
Frost dates for 60175 — Saint Charles, IL — last frost Apr 25, first frost Oct 19, zone 5b. whenisthelastfrost.com
Crop
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Start indoors: Jan 31 to Feb 14Transplant outside: Mar 28 to Apr 11
Start indoors: Feb 14 to Feb 28Transplant outside: May 9 to May 23
Start indoors: Feb 14 to Feb 28Transplant outside: May 9 to May 23
Start indoors: Feb 28 to Mar 14Transplant outside: May 2 to May 16
Start indoors: Feb 28 to Mar 14Transplant outside: Apr 4 to Apr 18Sow outdoors: Mar 28 to May 2Plant for fall: Aug 24 to Sep 21
Start indoors: Feb 28 to Mar 14Transplant outside: Mar 28 to Apr 11Sow outdoors: Mar 28 to Apr 11Plant for fall: Aug 10 to Aug 31
Start indoors: Feb 28 to Mar 14Transplant outside: Apr 11 to Apr 25Plant for fall: Jul 13 to Aug 3
Start indoors: Feb 28 to Mar 14Transplant outside: Apr 4 to Apr 18Plant for fall: Jul 13 to Aug 3
Start indoors: Feb 28 to Mar 14Transplant outside: Apr 11 to Apr 25Plant for fall: Jul 13 to Aug 3
Start indoors: Mar 14 to Mar 28Transplant outside: May 16 to May 30Sow outdoors: May 16 to May 30
Start indoors: Mar 14 to Mar 28Transplant outside: May 2 to May 16
Sow outdoors: Mar 14 to Apr 4Plant for fall: Jul 27 to Aug 17
Sow outdoors: Mar 14 to Apr 4Plant for fall: Aug 24 to Sep 14
Sow outdoors: Mar 21 to May 2Plant for fall: Sep 7 to Sep 28
Start indoors: Mar 28 to Apr 4Transplant outside: May 9 to May 16Sow outdoors: May 2 to May 16Plant for fall: Aug 3 to Aug 17
Start indoors: Mar 28 to Apr 4Sow outdoors: May 2 to May 16Plant for fall: Aug 10 to Aug 24
Start indoors: Mar 28 to Apr 4Sow outdoors: May 2 to May 16
Start indoors: Mar 28 to Apr 4Transplant outside: May 9 to May 23
Sow outdoors: Apr 4 to May 2Plant for fall: Jul 27 to Aug 10
Sow outdoors: Apr 4 to May 2Plant for fall: Aug 10 to Aug 24
Sow outdoors: Apr 4 to Apr 25
Sow outdoors: Apr 11 to May 9Plant for fall: Aug 10 to Aug 24
Sow outdoors: Apr 11 to May 2Plant for fall: Aug 24 to Sep 14
Sow outdoors: May 2 to May 23Plant for fall: Aug 3 to Aug 17
Sow outdoors: May 2 to May 16
Transplant outside: May 9 to May 30
Plant for fall: Oct 5 to Nov 9
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Saint Charles, IL
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 31 – Feb 14 | Mar 28 – Apr 11 | — | — |
| Peppers | Feb 14 – Feb 28 | May 9 – May 23 | — | — |
| Eggplant | Feb 14 – Feb 28 | May 9 – May 23 | — | — |
| Tomatoes | Feb 28 – Mar 14 | May 2 – May 16 | — | — |
| Lettuce | Feb 28 – Mar 14 | Apr 4 – Apr 18 | Mar 28 – May 2 | Aug 24 – Sep 21 |
| Kale | Feb 28 – Mar 14 | Mar 28 – Apr 11 | Mar 28 – Apr 11 | Aug 10 – Aug 31 |
| Broccoli | Feb 28 – Mar 14 | Apr 11 – Apr 25 | — | Jul 13 – Aug 3 |
| Cabbage | Feb 28 – Mar 14 | Apr 4 – Apr 18 | — | Jul 13 – Aug 3 |
| Cauliflower | Feb 28 – Mar 14 | Apr 11 – Apr 25 | — | Jul 13 – Aug 3 |
| Okra | Mar 14 – Mar 28 | May 16 – May 30 | May 16 – May 30 | — |
| Basil | Mar 14 – Mar 28 | May 2 – May 16 | — | — |
| Peas | — | — | Mar 14 – Apr 4 | Jul 27 – Aug 17 |
| Spinach | — | — | Mar 14 – Apr 4 | Aug 24 – Sep 14 |
| Radishes | — | — | Mar 21 – May 2 | Sep 7 – Sep 28 |
| Cucumbers | Mar 28 – Apr 4 | May 9 – May 16 | May 2 – May 16 | Aug 3 – Aug 17 |
| Zucchini & Summer Squash | Mar 28 – Apr 4 | — | May 2 – May 16 | Aug 10 – Aug 24 |
| Winter Squash & Pumpkins | Mar 28 – Apr 4 | — | May 2 – May 16 | — |
| Melons & Watermelon | Mar 28 – Apr 4 | May 9 – May 23 | — | — |
| Carrots | — | — | Apr 4 – May 2 | Jul 27 – Aug 10 |
| Beets | — | — | Apr 4 – May 2 | Aug 10 – Aug 24 |
| Potatoes | — | — | Apr 4 – Apr 25 | — |
| Swiss Chard | — | — | Apr 11 – May 9 | Aug 10 – Aug 24 |
| Cilantro | — | — | Apr 11 – May 2 | Aug 24 – Sep 14 |
| Green Beans | — | — | May 2 – May 23 | Aug 3 – Aug 17 |
| Sweet Corn | — | — | May 2 – May 16 | — |
| Sweet Potatoes | — | May 9 – May 30 | — | — |
| Garlic | — | — | — | Oct 5 – Nov 9 |
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 West Chicago Dupage Ap, IL weather station, 13 km away (elevation 755 ft (230 m)).
ZIP codes in Saint Charles: 60174 60175
Frost dates near Saint Charles
- Lafox Apr 25 · Oct 19
- Wasco Apr 25 · Oct 19
- Elburn Apr 28 · Oct 13
- South Elgin Apr 26 · Oct 18
- Geneva Apr 25 · Oct 19
- Wayne Apr 25 · Oct 19
- Elgin Apr 26 · Oct 18
- Batavia Apr 19 · Oct 23
Frequently asked questions
When is the last frost in Saint Charles, IL?
The median last spring frost in Saint Charles, IL is April 25. There is still about a 10% chance of frost after May 12, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Saint Charles, IL?
The median first fall frost is October 19, with about a 10% chance of frost before October 5.
How long is the growing season in Saint Charles, IL?
About 177 days between the median last spring frost and first fall frost.
What planting zone is Saint Charles, IL?
Saint Charles, IL is in USDA hardiness zone 5b.