Cullom, IL frost dates
Last spring frostApr 25median date
First fall frostOct 20median date
Growing season178 daysfrost-free
Hardiness zone5bZone 5b
How Cullom compares
- In 8 years out of 10, the last spring frost in Cullom falls between April 11 and May 10, a 29-day window. The first fall frost falls between October 2 and October 31.
- The median last frost is 8 days later than the Illinois median of Apr 17.
- Its 178-day growing season is longer than 24% 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 Bloomington, IL, 72 km away, the last frost here is the same as there and the growing season is 4 days longer.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 11 |
| 50% (median) | April 25 |
| 10% (safe for tender plants) | May 10 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 2 |
| 50% (median) | October 20 |
| 90% (late) | October 31 |
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 Cullom, IL
Cullom, IL frost dates — last frost Apr 25, first frost Oct 20, zone 5b. whenisthelastfrost.com
Crop
JFMAMJJASOND
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 25 to Sep 22
Start indoors: Feb 28 to Mar 14Transplant outside: Mar 28 to Apr 11Sow outdoors: Mar 28 to Apr 11Plant for fall: Aug 11 to Sep 1
Start indoors: Feb 28 to Mar 14Transplant outside: Apr 11 to Apr 25Plant for fall: Jul 14 to Aug 4
Start indoors: Feb 28 to Mar 14Transplant outside: Apr 4 to Apr 18Plant for fall: Jul 14 to Aug 4
Start indoors: Feb 28 to Mar 14Transplant outside: Apr 11 to Apr 25Plant for fall: Jul 14 to Aug 4
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 28 to Aug 18
Sow outdoors: Mar 14 to Apr 4Plant for fall: Aug 25 to Sep 15
Sow outdoors: Mar 21 to May 2Plant for fall: Sep 8 to Sep 29
Start indoors: Mar 28 to Apr 4Transplant outside: May 9 to May 16Sow outdoors: May 2 to May 16Plant for fall: Aug 4 to Aug 18
Start indoors: Mar 28 to Apr 4Sow outdoors: May 2 to May 16Plant for fall: Aug 11 to Aug 25
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 28 to Aug 11
Sow outdoors: Apr 4 to May 2Plant for fall: Aug 11 to Aug 25
Sow outdoors: Apr 4 to Apr 25
Sow outdoors: Apr 11 to May 9Plant for fall: Aug 11 to Aug 25
Sow outdoors: Apr 11 to May 2Plant for fall: Aug 25 to Sep 15
Sow outdoors: May 2 to May 23Plant for fall: Aug 4 to Aug 18
Sow outdoors: May 2 to May 16
Transplant outside: May 9 to May 30
Plant for fall: Oct 6 to Nov 10
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Cullom, 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 25 – Sep 22 |
| Kale | Feb 28 – Mar 14 | Mar 28 – Apr 11 | Mar 28 – Apr 11 | Aug 11 – Sep 1 |
| Broccoli | Feb 28 – Mar 14 | Apr 11 – Apr 25 | — | Jul 14 – Aug 4 |
| Cabbage | Feb 28 – Mar 14 | Apr 4 – Apr 18 | — | Jul 14 – Aug 4 |
| Cauliflower | Feb 28 – Mar 14 | Apr 11 – Apr 25 | — | Jul 14 – Aug 4 |
| 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 28 – Aug 18 |
| Spinach | — | — | Mar 14 – Apr 4 | Aug 25 – Sep 15 |
| Radishes | — | — | Mar 21 – May 2 | Sep 8 – Sep 29 |
| Cucumbers | Mar 28 – Apr 4 | May 9 – May 16 | May 2 – May 16 | Aug 4 – Aug 18 |
| Zucchini & Summer Squash | Mar 28 – Apr 4 | — | May 2 – May 16 | Aug 11 – Aug 25 |
| 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 28 – Aug 11 |
| Beets | — | — | Apr 4 – May 2 | Aug 11 – Aug 25 |
| Potatoes | — | — | Apr 4 – Apr 25 | — |
| Swiss Chard | — | — | Apr 11 – May 9 | Aug 11 – Aug 25 |
| Cilantro | — | — | Apr 11 – May 2 | Aug 25 – Sep 15 |
| Green Beans | — | — | May 2 – May 23 | Aug 4 – Aug 18 |
| Sweet Corn | — | — | May 2 – May 16 | — |
| Sweet Potatoes | — | May 9 – May 30 | — | — |
| Garlic | — | — | — | Oct 6 – Nov 10 |
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 Piper City, IL weather station, 16 km away (elevation 669 ft (204 m)).
Frost dates near Cullom
- Kempton Apr 25 · Oct 20
- Saunemin Apr 16 · Oct 24
- Emington Apr 27 · Oct 15
- Cabery Apr 27 · Oct 15
- Chatsworth Apr 25 · Oct 20
- Piper City Apr 25 · Oct 20
- Campus Apr 27 · Oct 15
- Forrest Apr 25 · Oct 20
- Buckingham Apr 27 · Oct 15
- Herscher Apr 19 · Oct 24
Frequently asked questions
When is the last frost in Cullom, IL?
The median last spring frost in Cullom, IL is April 25. There is still about a 10% chance of frost after May 10, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Cullom, IL?
The median first fall frost is October 20, with about a 10% chance of frost before October 2.
How long is the growing season in Cullom, IL?
About 178 days between the median last spring frost and first fall frost.
What planting zone is Cullom, IL?
Cullom, IL is in USDA hardiness zone 5b.