Sullivan, IN frost dates
Last spring frostApr 8median date
First fall frostOct 27median date
Growing season202 daysfrost-free
Hardiness zone6bZone 6b
How Sullivan compares
- In 8 years out of 10, the last spring frost in Sullivan falls between March 25 and April 24, a 30-day window. The first fall frost falls between October 12 and November 8.
- The median last frost is 14 days earlier than the Indiana median of Apr 22.
- Its 202-day growing season is longer than 89% of the 733 Indiana places with a regular frost season (state median 182 days).
- The last frost is 14 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 99 nights a year at or below 32°F.
- Compared with Terre Haute, IN, 41 km away, the last frost here is 7 days earlier than there and the growing season is 15 days longer.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 25 |
| 50% (median) | April 8 |
| 10% (safe for tender plants) | April 24 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 12 |
| 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 Sullivan, IN
Sullivan, IN frost dates — last frost Apr 8, first frost Oct 27, zone 6b. whenisthelastfrost.com
Crop
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Start indoors: Jan 14 to Jan 28Transplant outside: Mar 11 to Mar 25
Start indoors: Jan 28 to Feb 11Transplant outside: Apr 22 to May 6
Start indoors: Jan 28 to Feb 11Transplant outside: Apr 22 to May 6
Start indoors: Feb 11 to Feb 25Transplant outside: Apr 15 to Apr 29
Start indoors: Feb 11 to Feb 25Transplant outside: Mar 18 to Apr 1Sow outdoors: Mar 11 to Apr 15Plant for fall: Sep 1 to Sep 29
Start indoors: Feb 11 to Feb 25Transplant outside: Mar 11 to Mar 25Sow outdoors: Mar 11 to Mar 25Plant for fall: Aug 18 to Sep 8
Start indoors: Feb 11 to Feb 25Transplant outside: Mar 25 to Apr 8Plant for fall: Jul 21 to Aug 11
Start indoors: Feb 11 to Feb 25Transplant outside: Mar 18 to Apr 1Plant for fall: Jul 21 to Aug 11
Start indoors: Feb 11 to Feb 25Transplant outside: Mar 25 to Apr 8Plant for fall: Jul 21 to Aug 11
Start indoors: Feb 25 to Mar 11Transplant outside: Apr 29 to May 13Sow outdoors: Apr 29 to May 13
Start indoors: Feb 25 to Mar 11Transplant outside: Apr 15 to Apr 29
Sow outdoors: Feb 25 to Mar 18Plant for fall: Aug 4 to Aug 25
Sow outdoors: Feb 25 to Mar 18Plant for fall: Sep 1 to Sep 22
Sow outdoors: Mar 4 to Apr 15Plant for fall: Sep 15 to Oct 6
Start indoors: Mar 11 to Mar 18Transplant outside: Apr 22 to Apr 29Sow outdoors: Apr 15 to Apr 29Plant for fall: Aug 11 to Aug 25
Start indoors: Mar 11 to Mar 18Sow outdoors: Apr 15 to Apr 29Plant for fall: Aug 18 to Sep 1
Start indoors: Mar 11 to Mar 18Sow outdoors: Apr 15 to Apr 29
Start indoors: Mar 11 to Mar 18Transplant outside: Apr 22 to May 6
Sow outdoors: Mar 18 to Apr 15Plant for fall: Aug 4 to Aug 18
Sow outdoors: Mar 18 to Apr 15Plant for fall: Aug 18 to Sep 1
Sow outdoors: Mar 18 to Apr 8
Sow outdoors: Mar 25 to Apr 22Plant for fall: Aug 18 to Sep 1
Sow outdoors: Mar 25 to Apr 15Plant for fall: Sep 1 to Sep 22
Sow outdoors: Apr 15 to May 6Plant for fall: Aug 11 to Aug 25
Sow outdoors: Apr 15 to Apr 29
Transplant outside: Apr 22 to May 13
Plant for fall: Oct 13 to Nov 17
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Sullivan, IN
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 14 – Jan 28 | Mar 11 – Mar 25 | — | — |
| Peppers | Jan 28 – Feb 11 | Apr 22 – May 6 | — | — |
| Eggplant | Jan 28 – Feb 11 | Apr 22 – May 6 | — | — |
| Tomatoes | Feb 11 – Feb 25 | Apr 15 – Apr 29 | — | — |
| Lettuce | Feb 11 – Feb 25 | Mar 18 – Apr 1 | Mar 11 – Apr 15 | Sep 1 – Sep 29 |
| Kale | Feb 11 – Feb 25 | Mar 11 – Mar 25 | Mar 11 – Mar 25 | Aug 18 – Sep 8 |
| Broccoli | Feb 11 – Feb 25 | Mar 25 – Apr 8 | — | Jul 21 – Aug 11 |
| Cabbage | Feb 11 – Feb 25 | Mar 18 – Apr 1 | — | Jul 21 – Aug 11 |
| Cauliflower | Feb 11 – Feb 25 | Mar 25 – Apr 8 | — | Jul 21 – Aug 11 |
| Okra | Feb 25 – Mar 11 | Apr 29 – May 13 | Apr 29 – May 13 | — |
| Basil | Feb 25 – Mar 11 | Apr 15 – Apr 29 | — | — |
| Peas | — | — | Feb 25 – Mar 18 | Aug 4 – Aug 25 |
| Spinach | — | — | Feb 25 – Mar 18 | Sep 1 – Sep 22 |
| Radishes | — | — | Mar 4 – Apr 15 | Sep 15 – Oct 6 |
| Cucumbers | Mar 11 – Mar 18 | Apr 22 – Apr 29 | Apr 15 – Apr 29 | Aug 11 – Aug 25 |
| Zucchini & Summer Squash | Mar 11 – Mar 18 | — | Apr 15 – Apr 29 | Aug 18 – Sep 1 |
| Winter Squash & Pumpkins | Mar 11 – Mar 18 | — | Apr 15 – Apr 29 | — |
| Melons & Watermelon | Mar 11 – Mar 18 | Apr 22 – May 6 | — | — |
| Carrots | — | — | Mar 18 – Apr 15 | Aug 4 – Aug 18 |
| Beets | — | — | Mar 18 – Apr 15 | Aug 18 – Sep 1 |
| Potatoes | — | — | Mar 18 – Apr 8 | — |
| Swiss Chard | — | — | Mar 25 – Apr 22 | Aug 18 – Sep 1 |
| Cilantro | — | — | Mar 25 – Apr 15 | Sep 1 – Sep 22 |
| Green Beans | — | — | Apr 15 – May 6 | Aug 11 – Aug 25 |
| Sweet Corn | — | — | Apr 15 – Apr 29 | — |
| Sweet Potatoes | — | Apr 22 – May 13 | — | — |
| 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 Farmersburg Tv-2, IN weather station, 16 km away (elevation 548 ft (167 m)).
Frost dates near Sullivan
- Graysville Apr 12 · Oct 22
- Shelburn Apr 8 · Oct 27
- Paxton Apr 9 · Oct 30
- Hymera Apr 14 · Oct 26
- Dugger Apr 14 · Oct 26
- Carlisle Apr 9 · Oct 30
- Merom Apr 12 · Oct 22
- Fairbanks Apr 8 · Oct 27
- Coalmont Apr 14 · Oct 26
- Midland Apr 14 · Oct 26
Frequently asked questions
When is the last frost in Sullivan, IN?
The median last spring frost in Sullivan, IN is April 8. There is still about a 10% chance of frost after April 24, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Sullivan, IN?
The median first fall frost is October 27, with about a 10% chance of frost before October 12.
How long is the growing season in Sullivan, IN?
About 202 days between the median last spring frost and first fall frost.
What planting zone is Sullivan, IN?
Sullivan, IN is in USDA hardiness zone 6b.