Smithville, OK frost dates
Last spring frostApr 9median date
First fall frostOct 29median date
Growing season203 daysfrost-free
Hardiness zone7bZone 7b
How Smithville compares
- In 8 years out of 10, the last spring frost in Smithville falls between March 23 and April 24, a 32-day window. The first fall frost falls between October 14 and November 11.
- The median last frost is 5 days later than the Oklahoma median of Apr 4.
- Its 203-day growing season is longer than 19% of the 582 Oklahoma places with a regular frost season (state median 211 days).
- The last frost is 4 days later 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 88 nights a year at or below 32°F.
- Compared with Fort Smith, AR, 101 km away, the last frost here is 15 days later than there and the growing season is 23 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 23 |
| 50% (median) | April 9 |
| 10% (safe for tender plants) | April 24 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 14 |
| 50% (median) | October 29 |
| 90% (late) | November 11 |
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 Smithville, OK
Smithville, OK frost dates — last frost Apr 9, first frost Oct 29, zone 7b. whenisthelastfrost.com
Crop
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Start indoors: Jan 15 to Jan 29Transplant outside: Mar 12 to Mar 26
Start indoors: Jan 29 to Feb 12Transplant outside: Apr 23 to May 7
Start indoors: Jan 29 to Feb 12Transplant outside: Apr 23 to May 7
Start indoors: Feb 12 to Feb 26Transplant outside: Apr 16 to Apr 30
Start indoors: Feb 12 to Feb 26Transplant outside: Mar 19 to Apr 2Sow outdoors: Mar 12 to Apr 16Plant for fall: Sep 3 to Oct 1
Start indoors: Feb 12 to Feb 26Transplant outside: Mar 12 to Mar 26Sow outdoors: Mar 12 to Mar 26Plant for fall: Aug 20 to Sep 10
Start indoors: Feb 12 to Feb 26Transplant outside: Mar 26 to Apr 9Plant for fall: Jul 23 to Aug 13
Start indoors: Feb 12 to Feb 26Transplant outside: Mar 19 to Apr 2Plant for fall: Jul 23 to Aug 13
Start indoors: Feb 12 to Feb 26Transplant outside: Mar 26 to Apr 9Plant for fall: Jul 23 to Aug 13
Start indoors: Feb 26 to Mar 12Transplant outside: Apr 30 to May 14Sow outdoors: Apr 30 to May 14
Start indoors: Feb 26 to Mar 12Transplant outside: Apr 16 to Apr 30
Sow outdoors: Feb 26 to Mar 19Plant for fall: Aug 6 to Aug 27
Sow outdoors: Feb 26 to Mar 19Plant for fall: Sep 3 to Sep 24
Sow outdoors: Mar 5 to Apr 16Plant for fall: Sep 17 to Oct 8
Start indoors: Mar 12 to Mar 19Transplant outside: Apr 23 to Apr 30Sow outdoors: Apr 16 to Apr 30Plant for fall: Aug 13 to Aug 27
Start indoors: Mar 12 to Mar 19Sow outdoors: Apr 16 to Apr 30Plant for fall: Aug 20 to Sep 3
Start indoors: Mar 12 to Mar 19Sow outdoors: Apr 16 to Apr 30
Start indoors: Mar 12 to Mar 19Transplant outside: Apr 23 to May 7
Sow outdoors: Mar 19 to Apr 16Plant for fall: Aug 6 to Aug 20
Sow outdoors: Mar 19 to Apr 16Plant for fall: Aug 20 to Sep 3
Sow outdoors: Mar 19 to Apr 9
Sow outdoors: Mar 26 to Apr 23Plant for fall: Aug 20 to Sep 3
Sow outdoors: Mar 26 to Apr 16Plant for fall: Sep 3 to Sep 24
Sow outdoors: Apr 16 to May 7Plant for fall: Aug 13 to Aug 27
Sow outdoors: Apr 16 to Apr 30
Transplant outside: Apr 23 to May 14
Plant for fall: Oct 15 to Nov 19
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Smithville, OK
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 15 – Jan 29 | Mar 12 – Mar 26 | — | — |
| Peppers | Jan 29 – Feb 12 | Apr 23 – May 7 | — | — |
| Eggplant | Jan 29 – Feb 12 | Apr 23 – May 7 | — | — |
| Tomatoes | Feb 12 – Feb 26 | Apr 16 – Apr 30 | — | — |
| Lettuce | Feb 12 – Feb 26 | Mar 19 – Apr 2 | Mar 12 – Apr 16 | Sep 3 – Oct 1 |
| Kale | Feb 12 – Feb 26 | Mar 12 – Mar 26 | Mar 12 – Mar 26 | Aug 20 – Sep 10 |
| Broccoli | Feb 12 – Feb 26 | Mar 26 – Apr 9 | — | Jul 23 – Aug 13 |
| Cabbage | Feb 12 – Feb 26 | Mar 19 – Apr 2 | — | Jul 23 – Aug 13 |
| Cauliflower | Feb 12 – Feb 26 | Mar 26 – Apr 9 | — | Jul 23 – Aug 13 |
| Okra | Feb 26 – Mar 12 | Apr 30 – May 14 | Apr 30 – May 14 | — |
| Basil | Feb 26 – Mar 12 | Apr 16 – Apr 30 | — | — |
| Peas | — | — | Feb 26 – Mar 19 | Aug 6 – Aug 27 |
| Spinach | — | — | Feb 26 – Mar 19 | Sep 3 – Sep 24 |
| Radishes | — | — | Mar 5 – Apr 16 | Sep 17 – Oct 8 |
| Cucumbers | Mar 12 – Mar 19 | Apr 23 – Apr 30 | Apr 16 – Apr 30 | Aug 13 – Aug 27 |
| Zucchini & Summer Squash | Mar 12 – Mar 19 | — | Apr 16 – Apr 30 | Aug 20 – Sep 3 |
| Winter Squash & Pumpkins | Mar 12 – Mar 19 | — | Apr 16 – Apr 30 | — |
| Melons & Watermelon | Mar 12 – Mar 19 | Apr 23 – May 7 | — | — |
| Carrots | — | — | Mar 19 – Apr 16 | Aug 6 – Aug 20 |
| Beets | — | — | Mar 19 – Apr 16 | Aug 20 – Sep 3 |
| Potatoes | — | — | Mar 19 – Apr 9 | — |
| Swiss Chard | — | — | Mar 26 – Apr 23 | Aug 20 – Sep 3 |
| Cilantro | — | — | Mar 26 – Apr 16 | Sep 3 – Sep 24 |
| Green Beans | — | — | Apr 16 – May 7 | Aug 13 – Aug 27 |
| Sweet Corn | — | — | Apr 16 – Apr 30 | — |
| Sweet Potatoes | — | Apr 23 – May 14 | — | — |
| Garlic | — | — | — | Oct 15 – Nov 19 |
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 Smithville, OK weather station, 6 km away (elevation 823 ft (251 m)).
Frost dates near Smithville
- Watson Apr 9 · Oct 29
- Muse Apr 9 · Oct 29
- Bethel Apr 13 · Oct 27
- Honobia Apr 13 · Oct 27
- Battiest Apr 13 · Oct 27
- Whitesboro Apr 6 · Nov 2
- Hodgen Apr 6 · Nov 2
- Pickens Apr 13 · Oct 27
- Heavener Apr 6 · Nov 2
- Talihina Apr 11 · Oct 27
Frequently asked questions
When is the last frost in Smithville, OK?
The median last spring frost in Smithville, OK is April 9. 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 Smithville, OK?
The median first fall frost is October 29, with about a 10% chance of frost before October 14.
How long is the growing season in Smithville, OK?
About 203 days between the median last spring frost and first fall frost.
What planting zone is Smithville, OK?
Smithville, OK is in USDA hardiness zone 7b.