Nason, IL frost dates
Last spring frostApr 4median date
First fall frostOct 27median date
Growing season206 daysfrost-free
Hardiness zone6bZone 6b
How Nason compares
- In 8 years out of 10, the last spring frost in Nason falls between March 21 and April 19, a 29-day window. The first fall frost falls between October 16 and November 8.
- The median last frost is 13 days earlier than the Illinois median of Apr 17.
- Its 206-day growing season is longer than 93% of the 1,287 Illinois places with a regular frost season (state median 187 days).
- The last frost is 18 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 100 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 21 |
| 50% (median) | April 4 |
| 10% (safe for tender plants) | April 19 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 16 |
| 50% (median) | October 27 |
| 90% (late) | November 8 |
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 Nason, IL
Nason, IL frost dates — last frost Apr 4, first frost Oct 27, zone 6b. whenisthelastfrost.com
Crop
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Start indoors: Jan 10 to Jan 24Transplant outside: Mar 7 to Mar 21
Start indoors: Jan 24 to Feb 7Transplant outside: Apr 18 to May 2
Start indoors: Jan 24 to Feb 7Transplant outside: Apr 18 to May 2
Start indoors: Feb 7 to Feb 21Transplant outside: Apr 11 to Apr 25
Start indoors: Feb 7 to Feb 21Transplant outside: Mar 14 to Mar 28Sow outdoors: Mar 7 to Apr 11Plant for fall: Sep 1 to Sep 29
Start indoors: Feb 7 to Feb 21Transplant outside: Mar 7 to Mar 21Sow outdoors: Mar 7 to Mar 21Plant for fall: Aug 18 to Sep 8
Start indoors: Feb 7 to Feb 21Transplant outside: Mar 21 to Apr 4Plant for fall: Jul 21 to Aug 11
Start indoors: Feb 7 to Feb 21Transplant outside: Mar 14 to Mar 28Plant for fall: Jul 21 to Aug 11
Start indoors: Feb 7 to Feb 21Transplant outside: Mar 21 to Apr 4Plant for fall: Jul 21 to Aug 11
Start indoors: Feb 21 to Mar 7Transplant outside: Apr 25 to May 9Sow outdoors: Apr 25 to May 9
Start indoors: Feb 21 to Mar 7Transplant outside: Apr 11 to Apr 25
Sow outdoors: Feb 21 to Mar 14Plant for fall: Aug 4 to Aug 25
Sow outdoors: Feb 21 to Mar 14Plant for fall: Sep 1 to Sep 22
Sow outdoors: Feb 28 to Apr 11Plant for fall: Sep 15 to Oct 6
Start indoors: Mar 7 to Mar 14Transplant outside: Apr 18 to Apr 25Sow outdoors: Apr 11 to Apr 25Plant for fall: Aug 11 to Aug 25
Start indoors: Mar 7 to Mar 14Sow outdoors: Apr 11 to Apr 25Plant for fall: Aug 18 to Sep 1
Start indoors: Mar 7 to Mar 14Sow outdoors: Apr 11 to Apr 25
Start indoors: Mar 7 to Mar 14Transplant outside: Apr 18 to May 2
Sow outdoors: Mar 14 to Apr 11Plant for fall: Aug 4 to Aug 18
Sow outdoors: Mar 14 to Apr 11Plant for fall: Aug 18 to Sep 1
Sow outdoors: Mar 14 to Apr 4
Sow outdoors: Mar 21 to Apr 18Plant for fall: Aug 18 to Sep 1
Sow outdoors: Mar 21 to Apr 11Plant for fall: Sep 1 to Sep 22
Sow outdoors: Apr 11 to May 2Plant for fall: Aug 11 to Aug 25
Sow outdoors: Apr 11 to Apr 25
Transplant outside: Apr 18 to May 9
Plant for fall: Oct 13 to Nov 17
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Nason, IL
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 10 – Jan 24 | Mar 7 – Mar 21 | — | — |
| Peppers | Jan 24 – Feb 7 | Apr 18 – May 2 | — | — |
| Eggplant | Jan 24 – Feb 7 | Apr 18 – May 2 | — | — |
| Tomatoes | Feb 7 – Feb 21 | Apr 11 – Apr 25 | — | — |
| Lettuce | Feb 7 – Feb 21 | Mar 14 – Mar 28 | Mar 7 – Apr 11 | Sep 1 – Sep 29 |
| Kale | Feb 7 – Feb 21 | Mar 7 – Mar 21 | Mar 7 – Mar 21 | Aug 18 – Sep 8 |
| Broccoli | Feb 7 – Feb 21 | Mar 21 – Apr 4 | — | Jul 21 – Aug 11 |
| Cabbage | Feb 7 – Feb 21 | Mar 14 – Mar 28 | — | Jul 21 – Aug 11 |
| Cauliflower | Feb 7 – Feb 21 | Mar 21 – Apr 4 | — | Jul 21 – Aug 11 |
| Okra | Feb 21 – Mar 7 | Apr 25 – May 9 | Apr 25 – May 9 | — |
| Basil | Feb 21 – Mar 7 | Apr 11 – Apr 25 | — | — |
| Peas | — | — | Feb 21 – Mar 14 | Aug 4 – Aug 25 |
| Spinach | — | — | Feb 21 – Mar 14 | Sep 1 – Sep 22 |
| Radishes | — | — | Feb 28 – Apr 11 | Sep 15 – Oct 6 |
| Cucumbers | Mar 7 – Mar 14 | Apr 18 – Apr 25 | Apr 11 – Apr 25 | Aug 11 – Aug 25 |
| Zucchini & Summer Squash | Mar 7 – Mar 14 | — | Apr 11 – Apr 25 | Aug 18 – Sep 1 |
| Winter Squash & Pumpkins | Mar 7 – Mar 14 | — | Apr 11 – Apr 25 | — |
| Melons & Watermelon | Mar 7 – Mar 14 | Apr 18 – May 2 | — | — |
| Carrots | — | — | Mar 14 – Apr 11 | Aug 4 – Aug 18 |
| Beets | — | — | Mar 14 – Apr 11 | Aug 18 – Sep 1 |
| Potatoes | — | — | Mar 14 – Apr 4 | — |
| Swiss Chard | — | — | Mar 21 – Apr 18 | Aug 18 – Sep 1 |
| Cilantro | — | — | Mar 21 – Apr 11 | Sep 1 – Sep 22 |
| Green Beans | — | — | Apr 11 – May 2 | Aug 11 – Aug 25 |
| Sweet Corn | — | — | Apr 11 – Apr 25 | — |
| Sweet Potatoes | — | Apr 18 – May 9 | — | — |
| Garlic | — | — | — | Oct 13 – Nov 17 |
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 Rend Lake Dam, IL weather station, 14 km away (elevation 456 ft (139 m)).
Frost dates near Nason
- Bonnie Apr 11 · Oct 22
- Ina Apr 4 · Oct 28
- Waltonville Apr 4 · Oct 27
- Whittington Apr 4 · Oct 28
- Scheller Apr 4 · Oct 27
- Sesser Apr 4 · Oct 27
- Ewing Apr 4 · Oct 28
- Valier Apr 4 · Oct 27
- Mount Vernon Apr 11 · Oct 22
- Benton Apr 4 · Oct 28
Frequently asked questions
When is the last frost in Nason, IL?
The median last spring frost in Nason, IL is April 4. There is still about a 10% chance of frost after April 19, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Nason, IL?
The median first fall frost is October 27, with about a 10% chance of frost before October 16.
How long is the growing season in Nason, IL?
About 206 days between the median last spring frost and first fall frost.
What planting zone is Nason, IL?
Nason, IL is in USDA hardiness zone 6b.