Frost dates for 37922 — Knoxville, TN
Last spring frostApr 1median date
First fall frostNov 2median date
Growing season215 daysfrost-free
Hardiness zone7bZone 7b
How Knoxville compares
- In 8 years out of 10, the last spring frost in Knoxville falls between March 14 and April 17, a 34-day window. The first fall frost falls between October 21 and November 15.
- The median last frost is 6 days earlier than the Tennessee median of Apr 7.
- Its 215-day growing season is longer than 79% of the 548 Tennessee places with a regular frost season (state median 206 days).
- The last frost is 4 days earlier than the zone 7b median of Apr 5. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 7b chart.
- The weather station records an average of 67 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 14 |
| 50% (median) | April 1 |
| 10% (safe for tender plants) | April 17 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 21 |
| 50% (median) | November 2 |
| 90% (late) | November 15 |
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 Knoxville, TN
Frost dates for 37922 — Knoxville, TN — last frost Apr 1, first frost Nov 2, zone 7b. whenisthelastfrost.com
Crop
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Start indoors: Jan 7 to Jan 21Transplant outside: Mar 4 to Mar 18
Start indoors: Jan 21 to Feb 4Transplant outside: Apr 15 to Apr 29
Start indoors: Jan 21 to Feb 4Transplant outside: Apr 15 to Apr 29
Start indoors: Feb 4 to Feb 18Transplant outside: Apr 8 to Apr 22
Start indoors: Feb 4 to Feb 18Transplant outside: Mar 11 to Mar 25Sow outdoors: Mar 4 to Apr 8Plant for fall: Sep 7 to Oct 5
Start indoors: Feb 4 to Feb 18Transplant outside: Mar 4 to Mar 18Sow outdoors: Mar 4 to Mar 18Plant for fall: Aug 24 to Sep 14
Start indoors: Feb 4 to Feb 18Transplant outside: Mar 18 to Apr 1Plant for fall: Jul 27 to Aug 17
Start indoors: Feb 4 to Feb 18Transplant outside: Mar 11 to Mar 25Plant for fall: Jul 27 to Aug 17
Start indoors: Feb 4 to Feb 18Transplant outside: Mar 18 to Apr 1Plant for fall: Jul 27 to Aug 17
Start indoors: Feb 18 to Mar 4Transplant outside: Apr 22 to May 6Sow outdoors: Apr 22 to May 6
Start indoors: Feb 18 to Mar 4Transplant outside: Apr 8 to Apr 22
Sow outdoors: Feb 18 to Mar 11Plant for fall: Aug 10 to Aug 31
Sow outdoors: Feb 18 to Mar 11Plant for fall: Sep 7 to Sep 28
Sow outdoors: Feb 25 to Apr 8Plant for fall: Sep 21 to Oct 12
Start indoors: Mar 4 to Mar 11Transplant outside: Apr 15 to Apr 22Sow outdoors: Apr 8 to Apr 22Plant for fall: Aug 17 to Aug 31
Start indoors: Mar 4 to Mar 11Sow outdoors: Apr 8 to Apr 22Plant for fall: Aug 24 to Sep 7
Start indoors: Mar 4 to Mar 11Sow outdoors: Apr 8 to Apr 22
Start indoors: Mar 4 to Mar 11Transplant outside: Apr 15 to Apr 29
Sow outdoors: Mar 11 to Apr 8Plant for fall: Aug 10 to Aug 24
Sow outdoors: Mar 11 to Apr 8Plant for fall: Aug 24 to Sep 7
Sow outdoors: Mar 11 to Apr 1
Sow outdoors: Mar 18 to Apr 15Plant for fall: Aug 24 to Sep 7
Sow outdoors: Mar 18 to Apr 8Plant for fall: Sep 7 to Sep 28
Sow outdoors: Apr 8 to Apr 29Plant for fall: Aug 17 to Aug 31
Sow outdoors: Apr 8 to Apr 22
Transplant outside: Apr 15 to May 6
Plant for fall: Oct 19 to Nov 23
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Knoxville, TN
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 7 – Jan 21 | Mar 4 – Mar 18 | — | — |
| Peppers | Jan 21 – Feb 4 | Apr 15 – Apr 29 | — | — |
| Eggplant | Jan 21 – Feb 4 | Apr 15 – Apr 29 | — | — |
| Tomatoes | Feb 4 – Feb 18 | Apr 8 – Apr 22 | — | — |
| Lettuce | Feb 4 – Feb 18 | Mar 11 – Mar 25 | Mar 4 – Apr 8 | Sep 7 – Oct 5 |
| Kale | Feb 4 – Feb 18 | Mar 4 – Mar 18 | Mar 4 – Mar 18 | Aug 24 – Sep 14 |
| Broccoli | Feb 4 – Feb 18 | Mar 18 – Apr 1 | — | Jul 27 – Aug 17 |
| Cabbage | Feb 4 – Feb 18 | Mar 11 – Mar 25 | — | Jul 27 – Aug 17 |
| Cauliflower | Feb 4 – Feb 18 | Mar 18 – Apr 1 | — | Jul 27 – Aug 17 |
| Okra | Feb 18 – Mar 4 | Apr 22 – May 6 | Apr 22 – May 6 | — |
| Basil | Feb 18 – Mar 4 | Apr 8 – Apr 22 | — | — |
| Peas | — | — | Feb 18 – Mar 11 | Aug 10 – Aug 31 |
| Spinach | — | — | Feb 18 – Mar 11 | Sep 7 – Sep 28 |
| Radishes | — | — | Feb 25 – Apr 8 | Sep 21 – Oct 12 |
| Cucumbers | Mar 4 – Mar 11 | Apr 15 – Apr 22 | Apr 8 – Apr 22 | Aug 17 – Aug 31 |
| Zucchini & Summer Squash | Mar 4 – Mar 11 | — | Apr 8 – Apr 22 | Aug 24 – Sep 7 |
| Winter Squash & Pumpkins | Mar 4 – Mar 11 | — | Apr 8 – Apr 22 | — |
| Melons & Watermelon | Mar 4 – Mar 11 | Apr 15 – Apr 29 | — | — |
| Carrots | — | — | Mar 11 – Apr 8 | Aug 10 – Aug 24 |
| Beets | — | — | Mar 11 – Apr 8 | Aug 24 – Sep 7 |
| Potatoes | — | — | Mar 11 – Apr 1 | — |
| Swiss Chard | — | — | Mar 18 – Apr 15 | Aug 24 – Sep 7 |
| Cilantro | — | — | Mar 18 – Apr 8 | Sep 7 – Sep 28 |
| Green Beans | — | — | Apr 8 – Apr 29 | Aug 17 – Aug 31 |
| Sweet Corn | — | — | Apr 8 – Apr 22 | — |
| Sweet Potatoes | — | Apr 15 – May 6 | — | — |
| Garlic | — | — | — | Oct 19 – Nov 23 |
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 Knoxville Mcghee Tyson Ap, TN weather station, 13 km away (elevation 961 ft (293 m)).
ZIP codes in Knoxville: 37901 37902 37909 37912 37914 37915 37916 37917 37918 37919 37920 37921 37922 37923 37924 37927 37928 37929 37930 37931 37932 37933 37934 37938 37939 37940 37950 37995 37996 37997 37998
Frost dates near Knoxville
- Louisville Apr 1 · Nov 2
- Friendsville Apr 1 · Nov 2
- Lenoir City Apr 5 · Nov 1
- Alcoa Apr 1 · Nov 2
- Rockford Apr 1 · Nov 2
- Maryville Apr 1 · Nov 2
- Powell Apr 11 · Oct 28
- Greenback Apr 5 · Nov 1
Frequently asked questions
When is the last frost in Knoxville, TN?
The median last spring frost in Knoxville, TN is April 1. There is still about a 10% chance of frost after April 17, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Knoxville, TN?
The median first fall frost is November 2, with about a 10% chance of frost before October 21.
How long is the growing season in Knoxville, TN?
About 215 days between the median last spring frost and first fall frost.
What planting zone is Knoxville, TN?
Knoxville, TN is in USDA hardiness zone 7b.