Cosby, TN frost dates
Last spring frostApr 6median date
First fall frostNov 1median date
Growing season209 daysfrost-free
Hardiness zone7bZone 7b
How Cosby compares
- In 8 years out of 10, the last spring frost in Cosby falls between March 20 and April 23, a 34-day window. The first fall frost falls between October 20 and November 14.
- The median last frost is 1 day earlier than the Tennessee median of Apr 7.
- Its 209-day growing season is longer than 64% of the 548 Tennessee places with a regular frost season (state median 206 days).
- The last frost is typical for zone 7b, where the median is Apr 5.
- The weather station records an average of 78 nights a year at or below 32°F.
- Compared with Asheville, NC, 66 km away, the last frost here is the same as there and the growing season is 1 day longer.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 20 |
| 50% (median) | April 6 |
| 10% (safe for tender plants) | April 23 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 20 |
| 50% (median) | November 1 |
| 90% (late) | November 14 |
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 Cosby, TN
Cosby, TN frost dates — last frost Apr 6, first frost Nov 1, zone 7b. whenisthelastfrost.com
Crop
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Start indoors: Jan 12 to Jan 26Transplant outside: Mar 9 to Mar 23
Start indoors: Jan 26 to Feb 9Transplant outside: Apr 20 to May 4
Start indoors: Jan 26 to Feb 9Transplant outside: Apr 20 to May 4
Start indoors: Feb 9 to Feb 23Transplant outside: Apr 13 to Apr 27
Start indoors: Feb 9 to Feb 23Transplant outside: Mar 16 to Mar 30Sow outdoors: Mar 9 to Apr 13Plant for fall: Sep 6 to Oct 4
Start indoors: Feb 9 to Feb 23Transplant outside: Mar 9 to Mar 23Sow outdoors: Mar 9 to Mar 23Plant for fall: Aug 23 to Sep 13
Start indoors: Feb 9 to Feb 23Transplant outside: Mar 23 to Apr 6Plant for fall: Jul 26 to Aug 16
Start indoors: Feb 9 to Feb 23Transplant outside: Mar 16 to Mar 30Plant for fall: Jul 26 to Aug 16
Start indoors: Feb 9 to Feb 23Transplant outside: Mar 23 to Apr 6Plant for fall: Jul 26 to Aug 16
Start indoors: Feb 23 to Mar 9Transplant outside: Apr 27 to May 11Sow outdoors: Apr 27 to May 11
Start indoors: Feb 23 to Mar 9Transplant outside: Apr 13 to Apr 27
Sow outdoors: Feb 23 to Mar 16Plant for fall: Aug 9 to Aug 30
Sow outdoors: Feb 23 to Mar 16Plant for fall: Sep 6 to Sep 27
Sow outdoors: Mar 2 to Apr 13Plant for fall: Sep 20 to Oct 11
Start indoors: Mar 9 to Mar 16Transplant outside: Apr 20 to Apr 27Sow outdoors: Apr 13 to Apr 27Plant for fall: Aug 16 to Aug 30
Start indoors: Mar 9 to Mar 16Sow outdoors: Apr 13 to Apr 27Plant for fall: Aug 23 to Sep 6
Start indoors: Mar 9 to Mar 16Sow outdoors: Apr 13 to Apr 27
Start indoors: Mar 9 to Mar 16Transplant outside: Apr 20 to May 4
Sow outdoors: Mar 16 to Apr 13Plant for fall: Aug 9 to Aug 23
Sow outdoors: Mar 16 to Apr 13Plant for fall: Aug 23 to Sep 6
Sow outdoors: Mar 16 to Apr 6
Sow outdoors: Mar 23 to Apr 20Plant for fall: Aug 23 to Sep 6
Sow outdoors: Mar 23 to Apr 13Plant for fall: Sep 6 to Sep 27
Sow outdoors: Apr 13 to May 4Plant for fall: Aug 16 to Aug 30
Sow outdoors: Apr 13 to Apr 27
Transplant outside: Apr 20 to May 11
Plant for fall: Oct 18 to Nov 22
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Cosby, TN
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 12 – Jan 26 | Mar 9 – Mar 23 | — | — |
| Peppers | Jan 26 – Feb 9 | Apr 20 – May 4 | — | — |
| Eggplant | Jan 26 – Feb 9 | Apr 20 – May 4 | — | — |
| Tomatoes | Feb 9 – Feb 23 | Apr 13 – Apr 27 | — | — |
| Lettuce | Feb 9 – Feb 23 | Mar 16 – Mar 30 | Mar 9 – Apr 13 | Sep 6 – Oct 4 |
| Kale | Feb 9 – Feb 23 | Mar 9 – Mar 23 | Mar 9 – Mar 23 | Aug 23 – Sep 13 |
| Broccoli | Feb 9 – Feb 23 | Mar 23 – Apr 6 | — | Jul 26 – Aug 16 |
| Cabbage | Feb 9 – Feb 23 | Mar 16 – Mar 30 | — | Jul 26 – Aug 16 |
| Cauliflower | Feb 9 – Feb 23 | Mar 23 – Apr 6 | — | Jul 26 – Aug 16 |
| Okra | Feb 23 – Mar 9 | Apr 27 – May 11 | Apr 27 – May 11 | — |
| Basil | Feb 23 – Mar 9 | Apr 13 – Apr 27 | — | — |
| Peas | — | — | Feb 23 – Mar 16 | Aug 9 – Aug 30 |
| Spinach | — | — | Feb 23 – Mar 16 | Sep 6 – Sep 27 |
| Radishes | — | — | Mar 2 – Apr 13 | Sep 20 – Oct 11 |
| Cucumbers | Mar 9 – Mar 16 | Apr 20 – Apr 27 | Apr 13 – Apr 27 | Aug 16 – Aug 30 |
| Zucchini & Summer Squash | Mar 9 – Mar 16 | — | Apr 13 – Apr 27 | Aug 23 – Sep 6 |
| Winter Squash & Pumpkins | Mar 9 – Mar 16 | — | Apr 13 – Apr 27 | — |
| Melons & Watermelon | Mar 9 – Mar 16 | Apr 20 – May 4 | — | — |
| Carrots | — | — | Mar 16 – Apr 13 | Aug 9 – Aug 23 |
| Beets | — | — | Mar 16 – Apr 13 | Aug 23 – Sep 6 |
| Potatoes | — | — | Mar 16 – Apr 6 | — |
| Swiss Chard | — | — | Mar 23 – Apr 20 | Aug 23 – Sep 6 |
| Cilantro | — | — | Mar 23 – Apr 13 | Sep 6 – Sep 27 |
| Green Beans | — | — | Apr 13 – May 4 | Aug 16 – Aug 30 |
| Sweet Corn | — | — | Apr 13 – Apr 27 | — |
| Sweet Potatoes | — | Apr 20 – May 11 | — | — |
| Garlic | — | — | — | Oct 18 – Nov 22 |
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 Waterville, NC weather station, 13 km away (elevation 1,430 ft (436 m)).
Frost dates near Cosby
- Hartford Apr 6 · Nov 1
- Newport Apr 7 · Oct 29
- Del Rio Apr 6 · Nov 1
- Parrottsville Apr 7 · Oct 29
- Bybee Apr 7 · Oct 29
- Dandridge Apr 24 · Oct 17
- Gatlinburg Apr 17 · Oct 25
- White Pine Mar 31 · Nov 4
- Sevierville Apr 6 · Oct 29
- Pigeon Forge Apr 6 · Oct 29
Frequently asked questions
When is the last frost in Cosby, TN?
The median last spring frost in Cosby, TN is April 6. There is still about a 10% chance of frost after April 23, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Cosby, TN?
The median first fall frost is November 1, with about a 10% chance of frost before October 20.
How long is the growing season in Cosby, TN?
About 209 days between the median last spring frost and first fall frost.
What planting zone is Cosby, TN?
Cosby, TN is in USDA hardiness zone 7b.