Carbon, IN frost dates
Last spring frostApr 27median date
First fall frostOct 15median date
Growing season171 daysfrost-free
Hardiness zone6aZone 6a
How Carbon compares
- In 8 years out of 10, the last spring frost in Carbon falls between April 13 and May 15, a 32-day window. The first fall frost falls between October 1 and October 26.
- The median last frost is 5 days later than the Indiana median of Apr 22.
- Its 171-day growing season is longer than 12% of the 733 Indiana places with a regular frost season (state median 182 days).
- The last frost is typical for zone 6a, where the median is Apr 29.
- The weather station records an average of 124 nights a year at or below 32°F.
- Compared with Terre Haute, IN, 27 km away, the last frost here is 12 days later than there and the growing season is 16 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 13 |
| 50% (median) | April 27 |
| 10% (safe for tender plants) | May 15 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 1 |
| 50% (median) | October 15 |
| 90% (late) | October 26 |
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 Carbon, IN
Carbon, IN frost dates — last frost Apr 27, first frost Oct 15, zone 6a. whenisthelastfrost.com
Crop
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Start indoors: Feb 2 to Feb 16Transplant outside: Mar 30 to Apr 13
Start indoors: Feb 16 to Mar 2Transplant outside: May 11 to May 25
Start indoors: Feb 16 to Mar 2Transplant outside: May 11 to May 25
Start indoors: Mar 2 to Mar 16Transplant outside: May 4 to May 18
Start indoors: Mar 2 to Mar 16Transplant outside: Apr 6 to Apr 20Sow outdoors: Mar 30 to May 4Plant for fall: Aug 20 to Sep 17
Start indoors: Mar 2 to Mar 16Transplant outside: Mar 30 to Apr 13Sow outdoors: Mar 30 to Apr 13Plant for fall: Aug 6 to Aug 27
Start indoors: Mar 2 to Mar 16Transplant outside: Apr 13 to Apr 27Plant for fall: Jul 9 to Jul 30
Start indoors: Mar 2 to Mar 16Transplant outside: Apr 6 to Apr 20Plant for fall: Jul 9 to Jul 30
Start indoors: Mar 2 to Mar 16Transplant outside: Apr 13 to Apr 27Plant for fall: Jul 9 to Jul 30
Start indoors: Mar 16 to Mar 30Transplant outside: May 18 to Jun 1Sow outdoors: May 18 to Jun 1
Start indoors: Mar 16 to Mar 30Transplant outside: May 4 to May 18
Sow outdoors: Mar 16 to Apr 6Plant for fall: Jul 23 to Aug 13
Sow outdoors: Mar 16 to Apr 6Plant for fall: Aug 20 to Sep 10
Sow outdoors: Mar 23 to May 4Plant for fall: Sep 3 to Sep 24
Start indoors: Mar 30 to Apr 6Transplant outside: May 11 to May 18Sow outdoors: May 4 to May 18Plant for fall: Jul 30 to Aug 13
Start indoors: Mar 30 to Apr 6Sow outdoors: May 4 to May 18Plant for fall: Aug 6 to Aug 20
Start indoors: Mar 30 to Apr 6Sow outdoors: May 4 to May 18
Start indoors: Mar 30 to Apr 6Transplant outside: May 11 to May 25
Sow outdoors: Apr 6 to May 4Plant for fall: Jul 23 to Aug 6
Sow outdoors: Apr 6 to May 4Plant for fall: Aug 6 to Aug 20
Sow outdoors: Apr 6 to Apr 27
Sow outdoors: Apr 13 to May 11Plant for fall: Aug 6 to Aug 20
Sow outdoors: Apr 13 to May 4Plant for fall: Aug 20 to Sep 10
Sow outdoors: May 4 to May 25Plant for fall: Jul 30 to Aug 13
Sow outdoors: May 4 to May 18
Transplant outside: May 11 to Jun 1
Plant for fall: Oct 1 to Nov 5
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Carbon, IN
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 2 – Feb 16 | Mar 30 – Apr 13 | — | — |
| Peppers | Feb 16 – Mar 2 | May 11 – May 25 | — | — |
| Eggplant | Feb 16 – Mar 2 | May 11 – May 25 | — | — |
| Tomatoes | Mar 2 – Mar 16 | May 4 – May 18 | — | — |
| Lettuce | Mar 2 – Mar 16 | Apr 6 – Apr 20 | Mar 30 – May 4 | Aug 20 – Sep 17 |
| Kale | Mar 2 – Mar 16 | Mar 30 – Apr 13 | Mar 30 – Apr 13 | Aug 6 – Aug 27 |
| Broccoli | Mar 2 – Mar 16 | Apr 13 – Apr 27 | — | Jul 9 – Jul 30 |
| Cabbage | Mar 2 – Mar 16 | Apr 6 – Apr 20 | — | Jul 9 – Jul 30 |
| Cauliflower | Mar 2 – Mar 16 | Apr 13 – Apr 27 | — | Jul 9 – Jul 30 |
| Okra | Mar 16 – Mar 30 | May 18 – Jun 1 | May 18 – Jun 1 | — |
| Basil | Mar 16 – Mar 30 | May 4 – May 18 | — | — |
| Peas | — | — | Mar 16 – Apr 6 | Jul 23 – Aug 13 |
| Spinach | — | — | Mar 16 – Apr 6 | Aug 20 – Sep 10 |
| Radishes | — | — | Mar 23 – May 4 | Sep 3 – Sep 24 |
| Cucumbers | Mar 30 – Apr 6 | May 11 – May 18 | May 4 – May 18 | Jul 30 – Aug 13 |
| Zucchini & Summer Squash | Mar 30 – Apr 6 | — | May 4 – May 18 | Aug 6 – Aug 20 |
| Winter Squash & Pumpkins | Mar 30 – Apr 6 | — | May 4 – May 18 | — |
| Melons & Watermelon | Mar 30 – Apr 6 | May 11 – May 25 | — | — |
| Carrots | — | — | Apr 6 – May 4 | Jul 23 – Aug 6 |
| Beets | — | — | Apr 6 – May 4 | Aug 6 – Aug 20 |
| Potatoes | — | — | Apr 6 – Apr 27 | — |
| Swiss Chard | — | — | Apr 13 – May 11 | Aug 6 – Aug 20 |
| Cilantro | — | — | Apr 13 – May 4 | Aug 20 – Sep 10 |
| Green Beans | — | — | May 4 – May 25 | Jul 30 – Aug 13 |
| Sweet Corn | — | — | May 4 – May 18 | — |
| Sweet Potatoes | — | May 11 – Jun 1 | — | — |
| Garlic | — | — | — | Oct 1 – Nov 5 |
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 Greencastle 1 W, IN weather station, 21 km away (elevation 735 ft (224 m)).
Frost dates near Carbon
- Harmony Apr 27 · Oct 15
- Knightsville Apr 14 · Oct 24
- Brazil Apr 14 · Oct 24
- Bridgeton Apr 30 · Oct 12
- Fontanet Apr 14 · Oct 24
- Staunton Apr 14 · Oct 24
- Reelsville Apr 27 · Oct 15
- Seelyville Apr 14 · Oct 24
- Rosedale Apr 30 · Oct 12
- Poland Apr 27 · Oct 15
Frequently asked questions
When is the last frost in Carbon, IN?
The median last spring frost in Carbon, IN is April 27. There is still about a 10% chance of frost after May 15, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Carbon, IN?
The median first fall frost is October 15, with about a 10% chance of frost before October 1.
How long is the growing season in Carbon, IN?
About 171 days between the median last spring frost and first fall frost.
What planting zone is Carbon, IN?
Carbon, IN is in USDA hardiness zone 6a.