Ullin, IL frost dates
Last spring frostApr 3median date
First fall frostNov 5median date
Growing season216 daysfrost-free
Hardiness zone7aZone 7a
How Ullin compares
- In 8 years out of 10, the last spring frost in Ullin falls between March 17 and April 21, a 35-day window. The first fall frost falls between October 23 and November 22.
- The median last frost is 14 days earlier than the Illinois median of Apr 17.
- Its 216-day growing season is among the longest of the 1,287 Illinois places with a regular frost season.
- The last frost is 13 days earlier than the zone 7a median of Apr 16. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 7a chart.
- The weather station records an average of 80 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 17 |
| 50% (median) | April 3 |
| 10% (safe for tender plants) | April 21 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 23 |
| 50% (median) | November 5 |
| 90% (late) | November 22 |
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 Ullin, IL
Ullin, IL frost dates — last frost Apr 3, first frost Nov 5, zone 7a. whenisthelastfrost.com
Crop
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Start indoors: Jan 9 to Jan 23Transplant outside: Mar 6 to Mar 20
Start indoors: Jan 23 to Feb 6Transplant outside: Apr 17 to May 1
Start indoors: Jan 23 to Feb 6Transplant outside: Apr 17 to May 1
Start indoors: Feb 6 to Feb 20Transplant outside: Apr 10 to Apr 24
Start indoors: Feb 6 to Feb 20Transplant outside: Mar 13 to Mar 27Sow outdoors: Mar 6 to Apr 10Plant for fall: Sep 10 to Oct 8
Start indoors: Feb 6 to Feb 20Transplant outside: Mar 6 to Mar 20Sow outdoors: Mar 6 to Mar 20Plant for fall: Aug 27 to Sep 17
Start indoors: Feb 6 to Feb 20Transplant outside: Mar 20 to Apr 3Plant for fall: Jul 30 to Aug 20
Start indoors: Feb 6 to Feb 20Transplant outside: Mar 13 to Mar 27Plant for fall: Jul 30 to Aug 20
Start indoors: Feb 6 to Feb 20Transplant outside: Mar 20 to Apr 3Plant for fall: Jul 30 to Aug 20
Start indoors: Feb 20 to Mar 6Transplant outside: Apr 24 to May 8Sow outdoors: Apr 24 to May 8
Start indoors: Feb 20 to Mar 6Transplant outside: Apr 10 to Apr 24
Sow outdoors: Feb 20 to Mar 13Plant for fall: Aug 13 to Sep 3
Sow outdoors: Feb 20 to Mar 13Plant for fall: Sep 10 to Oct 1
Sow outdoors: Feb 27 to Apr 10Plant for fall: Sep 24 to Oct 15
Start indoors: Mar 6 to Mar 13Transplant outside: Apr 17 to Apr 24Sow outdoors: Apr 10 to Apr 24Plant for fall: Aug 20 to Sep 3
Start indoors: Mar 6 to Mar 13Sow outdoors: Apr 10 to Apr 24Plant for fall: Aug 27 to Sep 10
Start indoors: Mar 6 to Mar 13Sow outdoors: Apr 10 to Apr 24
Start indoors: Mar 6 to Mar 13Transplant outside: Apr 17 to May 1
Sow outdoors: Mar 13 to Apr 10Plant for fall: Aug 13 to Aug 27
Sow outdoors: Mar 13 to Apr 10Plant for fall: Aug 27 to Sep 10
Sow outdoors: Mar 13 to Apr 3
Sow outdoors: Mar 20 to Apr 17Plant for fall: Aug 27 to Sep 10
Sow outdoors: Mar 20 to Apr 10Plant for fall: Sep 10 to Oct 1
Sow outdoors: Apr 10 to May 1Plant for fall: Aug 20 to Sep 3
Sow outdoors: Apr 10 to Apr 24
Transplant outside: Apr 17 to May 8
Plant for fall: Oct 22 to Nov 26
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Ullin, IL
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 9 – Jan 23 | Mar 6 – Mar 20 | — | — |
| Peppers | Jan 23 – Feb 6 | Apr 17 – May 1 | — | — |
| Eggplant | Jan 23 – Feb 6 | Apr 17 – May 1 | — | — |
| Tomatoes | Feb 6 – Feb 20 | Apr 10 – Apr 24 | — | — |
| Lettuce | Feb 6 – Feb 20 | Mar 13 – Mar 27 | Mar 6 – Apr 10 | Sep 10 – Oct 8 |
| Kale | Feb 6 – Feb 20 | Mar 6 – Mar 20 | Mar 6 – Mar 20 | Aug 27 – Sep 17 |
| Broccoli | Feb 6 – Feb 20 | Mar 20 – Apr 3 | — | Jul 30 – Aug 20 |
| Cabbage | Feb 6 – Feb 20 | Mar 13 – Mar 27 | — | Jul 30 – Aug 20 |
| Cauliflower | Feb 6 – Feb 20 | Mar 20 – Apr 3 | — | Jul 30 – Aug 20 |
| Okra | Feb 20 – Mar 6 | Apr 24 – May 8 | Apr 24 – May 8 | — |
| Basil | Feb 20 – Mar 6 | Apr 10 – Apr 24 | — | — |
| Peas | — | — | Feb 20 – Mar 13 | Aug 13 – Sep 3 |
| Spinach | — | — | Feb 20 – Mar 13 | Sep 10 – Oct 1 |
| Radishes | — | — | Feb 27 – Apr 10 | Sep 24 – Oct 15 |
| Cucumbers | Mar 6 – Mar 13 | Apr 17 – Apr 24 | Apr 10 – Apr 24 | Aug 20 – Sep 3 |
| Zucchini & Summer Squash | Mar 6 – Mar 13 | — | Apr 10 – Apr 24 | Aug 27 – Sep 10 |
| Winter Squash & Pumpkins | Mar 6 – Mar 13 | — | Apr 10 – Apr 24 | — |
| Melons & Watermelon | Mar 6 – Mar 13 | Apr 17 – May 1 | — | — |
| Carrots | — | — | Mar 13 – Apr 10 | Aug 13 – Aug 27 |
| Beets | — | — | Mar 13 – Apr 10 | Aug 27 – Sep 10 |
| Potatoes | — | — | Mar 13 – Apr 3 | — |
| Swiss Chard | — | — | Mar 20 – Apr 17 | Aug 27 – Sep 10 |
| Cilantro | — | — | Mar 20 – Apr 10 | Sep 10 – Oct 1 |
| Green Beans | — | — | Apr 10 – May 1 | Aug 20 – Sep 3 |
| Sweet Corn | — | — | Apr 10 – Apr 24 | — |
| Sweet Potatoes | — | Apr 17 – May 8 | — | — |
| Garlic | — | — | — | Oct 22 – Nov 26 |
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 Grand Chain Dam, IL weather station, 15 km away (elevation 384 ft (117 m)).
Frost dates near Ullin
- Pulaski Apr 3 · Nov 5
- Millcreek Apr 8 · Oct 29
- Tamms Apr 3 · Nov 5
- Perks Apr 3 · Nov 5
- Dongola Apr 8 · Oct 29
- Olmsted Apr 3 · Nov 5
- Villa Ridge Apr 2 · Oct 31
- Grand Chain Apr 3 · Nov 5
- Mounds Apr 2 · Oct 31
- Karnak Apr 3 · Nov 5
Frequently asked questions
When is the last frost in Ullin, IL?
The median last spring frost in Ullin, IL is April 3. There is still about a 10% chance of frost after April 21, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Ullin, IL?
The median first fall frost is November 5, with about a 10% chance of frost before October 23.
How long is the growing season in Ullin, IL?
About 216 days between the median last spring frost and first fall frost.
What planting zone is Ullin, IL?
Ullin, IL is in USDA hardiness zone 7a.