Knoxville, AR frost dates
Last spring frostMar 24median date
First fall frostNov 10median date
Growing season231 daysfrost-free
Hardiness zone8aZone 8a
How Knoxville compares
- In 8 years out of 10, the last spring frost in Knoxville falls between March 4 and April 10, a 37-day window. The first fall frost falls between October 28 and November 29.
- The median last frost is 4 days earlier than the Arkansas median of Mar 28.
- Its 231-day growing season is longer than 70% of the 603 Arkansas places with a regular frost season (state median 222 days).
- The last frost is 5 days earlier than the zone 8a median of Mar 29. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 8a chart.
- The weather station records an average of 70 nights a year at or below 32°F.
- Compared with Conway, AR, 93 km away, the last frost here is 9 days earlier than there and the growing season is 17 days longer.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 4 |
| 50% (median) | March 24 |
| 10% (safe for tender plants) | April 10 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 28 |
| 50% (median) | November 10 |
| 90% (late) | November 29 |
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, AR
Knoxville, AR frost dates — last frost Mar 24, first frost Nov 10, zone 8a. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Dec 30 to Jan 13Start indoors: Dec 30 to Jan 13Transplant outside: Feb 24 to Mar 10
Start indoors: Jan 13 to Jan 27Transplant outside: Apr 7 to Apr 21
Start indoors: Jan 13 to Jan 27Transplant outside: Apr 7 to Apr 21
Start indoors: Jan 27 to Feb 10Transplant outside: Mar 31 to Apr 14
Start indoors: Jan 27 to Feb 10Transplant outside: Mar 3 to Mar 17Sow outdoors: Feb 24 to Mar 31Plant for fall: Sep 15 to Oct 13
Start indoors: Jan 27 to Feb 10Transplant outside: Feb 24 to Mar 10Sow outdoors: Feb 24 to Mar 10Plant for fall: Sep 1 to Sep 22
Start indoors: Jan 27 to Feb 10Transplant outside: Mar 10 to Mar 24Plant for fall: Aug 4 to Aug 25
Start indoors: Jan 27 to Feb 10Transplant outside: Mar 3 to Mar 17Plant for fall: Aug 4 to Aug 25
Start indoors: Jan 27 to Feb 10Transplant outside: Mar 10 to Mar 24Plant for fall: Aug 4 to Aug 25
Start indoors: Feb 10 to Feb 24Transplant outside: Apr 14 to Apr 28Sow outdoors: Apr 14 to Apr 28
Start indoors: Feb 10 to Feb 24Transplant outside: Mar 31 to Apr 14
Sow outdoors: Feb 10 to Mar 3Plant for fall: Aug 18 to Sep 8
Sow outdoors: Feb 10 to Mar 3Plant for fall: Sep 15 to Oct 6
Sow outdoors: Feb 17 to Mar 31Plant for fall: Sep 29 to Oct 20
Start indoors: Feb 24 to Mar 3Transplant outside: Apr 7 to Apr 14Sow outdoors: Mar 31 to Apr 14Plant for fall: Aug 25 to Sep 8
Start indoors: Feb 24 to Mar 3Sow outdoors: Mar 31 to Apr 14Plant for fall: Sep 1 to Sep 15
Start indoors: Feb 24 to Mar 3Sow outdoors: Mar 31 to Apr 14
Start indoors: Feb 24 to Mar 3Transplant outside: Apr 7 to Apr 21
Sow outdoors: Mar 3 to Mar 31Plant for fall: Aug 18 to Sep 1
Sow outdoors: Mar 3 to Mar 31Plant for fall: Sep 1 to Sep 15
Sow outdoors: Mar 3 to Mar 24
Sow outdoors: Mar 10 to Apr 7Plant for fall: Sep 1 to Sep 15
Sow outdoors: Mar 10 to Mar 31Plant for fall: Sep 15 to Oct 6
Sow outdoors: Mar 31 to Apr 21Plant for fall: Aug 25 to Sep 8
Sow outdoors: Mar 31 to Apr 14
Transplant outside: Apr 7 to Apr 28
Plant for fall: Oct 27 to Dec 1
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Knoxville, AR
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Dec 30 – Jan 13 | Feb 24 – Mar 10 | — | — |
| Peppers | Jan 13 – Jan 27 | Apr 7 – Apr 21 | — | — |
| Eggplant | Jan 13 – Jan 27 | Apr 7 – Apr 21 | — | — |
| Tomatoes | Jan 27 – Feb 10 | Mar 31 – Apr 14 | — | — |
| Lettuce | Jan 27 – Feb 10 | Mar 3 – Mar 17 | Feb 24 – Mar 31 | Sep 15 – Oct 13 |
| Kale | Jan 27 – Feb 10 | Feb 24 – Mar 10 | Feb 24 – Mar 10 | Sep 1 – Sep 22 |
| Broccoli | Jan 27 – Feb 10 | Mar 10 – Mar 24 | — | Aug 4 – Aug 25 |
| Cabbage | Jan 27 – Feb 10 | Mar 3 – Mar 17 | — | Aug 4 – Aug 25 |
| Cauliflower | Jan 27 – Feb 10 | Mar 10 – Mar 24 | — | Aug 4 – Aug 25 |
| Okra | Feb 10 – Feb 24 | Apr 14 – Apr 28 | Apr 14 – Apr 28 | — |
| Basil | Feb 10 – Feb 24 | Mar 31 – Apr 14 | — | — |
| Peas | — | — | Feb 10 – Mar 3 | Aug 18 – Sep 8 |
| Spinach | — | — | Feb 10 – Mar 3 | Sep 15 – Oct 6 |
| Radishes | — | — | Feb 17 – Mar 31 | Sep 29 – Oct 20 |
| Cucumbers | Feb 24 – Mar 3 | Apr 7 – Apr 14 | Mar 31 – Apr 14 | Aug 25 – Sep 8 |
| Zucchini & Summer Squash | Feb 24 – Mar 3 | — | Mar 31 – Apr 14 | Sep 1 – Sep 15 |
| Winter Squash & Pumpkins | Feb 24 – Mar 3 | — | Mar 31 – Apr 14 | — |
| Melons & Watermelon | Feb 24 – Mar 3 | Apr 7 – Apr 21 | — | — |
| Carrots | — | — | Mar 3 – Mar 31 | Aug 18 – Sep 1 |
| Beets | — | — | Mar 3 – Mar 31 | Sep 1 – Sep 15 |
| Potatoes | — | — | Mar 3 – Mar 24 | — |
| Swiss Chard | — | — | Mar 10 – Apr 7 | Sep 1 – Sep 15 |
| Cilantro | — | — | Mar 10 – Mar 31 | Sep 15 – Oct 6 |
| Green Beans | — | — | Mar 31 – Apr 21 | Aug 25 – Sep 8 |
| Sweet Corn | — | — | Mar 31 – Apr 14 | — |
| Sweet Potatoes | — | Apr 7 – Apr 28 | — | — |
| Garlic | — | — | — | Oct 27 – Dec 1 |
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 Clarksville 2n, AR weather station, 17 km away (elevation 449 ft (137 m)).
Frost dates near Knoxville
- Lamar Mar 25 · Nov 10
- London Apr 1 · Nov 2
- New Blaine Mar 28 · Nov 5
- Delaware Apr 1 · Nov 2
- Scranton Mar 28 · Nov 5
- Clarksville Mar 24 · Nov 10
- Dover Mar 29 · Nov 2
- Subiaco Mar 28 · Nov 5
- Hartman Mar 24 · Nov 10
- Russellville Mar 29 · Nov 2
Frequently asked questions
When is the last frost in Knoxville, AR?
The median last spring frost in Knoxville, AR is March 24. There is still about a 10% chance of frost after April 10, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Knoxville, AR?
The median first fall frost is November 10, with about a 10% chance of frost before October 28.
How long is the growing season in Knoxville, AR?
About 231 days between the median last spring frost and first fall frost.
What planting zone is Knoxville, AR?
Knoxville, AR is in USDA hardiness zone 8a.