Guymon, OK frost dates
Last spring frostApr 18median date
First fall frostOct 23median date
Growing season188 daysfrost-free
Hardiness zone6bZone 6b
How Guymon compares
- In 8 years out of 10, the last spring frost in Guymon falls between April 4 and May 1, a 27-day window. The first fall frost falls between October 11 and November 3.
- The median last frost is 14 days later than the Oklahoma median of Apr 4.
- Its 188-day growing season is longer than 3% of the 582 Oklahoma places with a regular frost season (state median 211 days).
- The last frost is 4 days earlier than the zone 6b median of Apr 22. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 6b chart.
- The weather station records an average of 122 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 4 |
| 50% (median) | April 18 |
| 10% (safe for tender plants) | May 1 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 11 |
| 50% (median) | October 23 |
| 90% (late) | November 3 |
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 Guymon, OK
Guymon, OK frost dates — last frost Apr 18, first frost Oct 23, zone 6b. whenisthelastfrost.com
Crop
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Start indoors: Jan 24 to Feb 7Transplant outside: Mar 21 to Apr 4
Start indoors: Feb 7 to Feb 21Transplant outside: May 2 to May 16
Start indoors: Feb 7 to Feb 21Transplant outside: May 2 to May 16
Start indoors: Feb 21 to Mar 7Transplant outside: Apr 25 to May 9
Start indoors: Feb 21 to Mar 7Transplant outside: Mar 28 to Apr 11Sow outdoors: Mar 21 to Apr 25Plant for fall: Aug 28 to Sep 25
Start indoors: Feb 21 to Mar 7Transplant outside: Mar 21 to Apr 4Sow outdoors: Mar 21 to Apr 4Plant for fall: Aug 14 to Sep 4
Start indoors: Feb 21 to Mar 7Transplant outside: Apr 4 to Apr 18Plant for fall: Jul 17 to Aug 7
Start indoors: Feb 21 to Mar 7Transplant outside: Mar 28 to Apr 11Plant for fall: Jul 17 to Aug 7
Start indoors: Feb 21 to Mar 7Transplant outside: Apr 4 to Apr 18Plant for fall: Jul 17 to Aug 7
Start indoors: Mar 7 to Mar 21Transplant outside: May 9 to May 23Sow outdoors: May 9 to May 23
Start indoors: Mar 7 to Mar 21Transplant outside: Apr 25 to May 9
Sow outdoors: Mar 7 to Mar 28Plant for fall: Jul 31 to Aug 21
Sow outdoors: Mar 7 to Mar 28Plant for fall: Aug 28 to Sep 18
Sow outdoors: Mar 14 to Apr 25Plant for fall: Sep 11 to Oct 2
Start indoors: Mar 21 to Mar 28Transplant outside: May 2 to May 9Sow outdoors: Apr 25 to May 9Plant for fall: Aug 7 to Aug 21
Start indoors: Mar 21 to Mar 28Sow outdoors: Apr 25 to May 9Plant for fall: Aug 14 to Aug 28
Start indoors: Mar 21 to Mar 28Sow outdoors: Apr 25 to May 9
Start indoors: Mar 21 to Mar 28Transplant outside: May 2 to May 16
Sow outdoors: Mar 28 to Apr 25Plant for fall: Jul 31 to Aug 14
Sow outdoors: Mar 28 to Apr 25Plant for fall: Aug 14 to Aug 28
Sow outdoors: Mar 28 to Apr 18
Sow outdoors: Apr 4 to May 2Plant for fall: Aug 14 to Aug 28
Sow outdoors: Apr 4 to Apr 25Plant for fall: Aug 28 to Sep 18
Sow outdoors: Apr 25 to May 16Plant for fall: Aug 7 to Aug 21
Sow outdoors: Apr 25 to May 9
Transplant outside: May 2 to May 23
Plant for fall: Oct 9 to Nov 13
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Guymon, OK
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 24 – Feb 7 | Mar 21 – Apr 4 | — | — |
| Peppers | Feb 7 – Feb 21 | May 2 – May 16 | — | — |
| Eggplant | Feb 7 – Feb 21 | May 2 – May 16 | — | — |
| Tomatoes | Feb 21 – Mar 7 | Apr 25 – May 9 | — | — |
| Lettuce | Feb 21 – Mar 7 | Mar 28 – Apr 11 | Mar 21 – Apr 25 | Aug 28 – Sep 25 |
| Kale | Feb 21 – Mar 7 | Mar 21 – Apr 4 | Mar 21 – Apr 4 | Aug 14 – Sep 4 |
| Broccoli | Feb 21 – Mar 7 | Apr 4 – Apr 18 | — | Jul 17 – Aug 7 |
| Cabbage | Feb 21 – Mar 7 | Mar 28 – Apr 11 | — | Jul 17 – Aug 7 |
| Cauliflower | Feb 21 – Mar 7 | Apr 4 – Apr 18 | — | Jul 17 – Aug 7 |
| Okra | Mar 7 – Mar 21 | May 9 – May 23 | May 9 – May 23 | — |
| Basil | Mar 7 – Mar 21 | Apr 25 – May 9 | — | — |
| Peas | — | — | Mar 7 – Mar 28 | Jul 31 – Aug 21 |
| Spinach | — | — | Mar 7 – Mar 28 | Aug 28 – Sep 18 |
| Radishes | — | — | Mar 14 – Apr 25 | Sep 11 – Oct 2 |
| Cucumbers | Mar 21 – Mar 28 | May 2 – May 9 | Apr 25 – May 9 | Aug 7 – Aug 21 |
| Zucchini & Summer Squash | Mar 21 – Mar 28 | — | Apr 25 – May 9 | Aug 14 – Aug 28 |
| Winter Squash & Pumpkins | Mar 21 – Mar 28 | — | Apr 25 – May 9 | — |
| Melons & Watermelon | Mar 21 – Mar 28 | May 2 – May 16 | — | — |
| Carrots | — | — | Mar 28 – Apr 25 | Jul 31 – Aug 14 |
| Beets | — | — | Mar 28 – Apr 25 | Aug 14 – Aug 28 |
| Potatoes | — | — | Mar 28 – Apr 18 | — |
| Swiss Chard | — | — | Apr 4 – May 2 | Aug 14 – Aug 28 |
| Cilantro | — | — | Apr 4 – Apr 25 | Aug 28 – Sep 18 |
| Green Beans | — | — | Apr 25 – May 16 | Aug 7 – Aug 21 |
| Sweet Corn | — | — | Apr 25 – May 9 | — |
| Sweet Potatoes | — | May 2 – May 23 | — | — |
| Garlic | — | — | — | Oct 9 – Nov 13 |
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 Guymon Muni Ap, OK weather station, 3 km away (elevation 3,123 ft (952 m)).
Frost dates near Guymon
- Goodwell Apr 24 · Oct 19
- Hooker Apr 16 · Oct 25
- Hardesty Apr 16 · Oct 25
- Adams Apr 16 · Oct 25
- Texhoma Apr 18 · Oct 24
- Tyrone Apr 20 · Oct 24
- Turpin Apr 17 · Oct 25
- Keyes Apr 26 · Oct 17
- Balko Apr 14 · Oct 30
- Forgan Apr 21 · Oct 21
Frequently asked questions
When is the last frost in Guymon, OK?
The median last spring frost in Guymon, OK is April 18. There is still about a 10% chance of frost after May 1, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Guymon, OK?
The median first fall frost is October 23, with about a 10% chance of frost before October 11.
How long is the growing season in Guymon, OK?
About 188 days between the median last spring frost and first fall frost.
What planting zone is Guymon, OK?
Guymon, OK is in USDA hardiness zone 6b.