Hillsdale, OK frost dates
Last spring frostApr 6median date
First fall frostNov 1median date
Growing season209 daysfrost-free
Hardiness zone7aZone 7a
How Hillsdale compares
- In 8 years out of 10, the last spring frost in Hillsdale falls between March 20 and April 21, a 32-day window. The first fall frost falls between October 21 and November 15.
- The median last frost is 2 days later than the Oklahoma median of Apr 4.
- Its 209-day growing season is longer than 35% of the 582 Oklahoma places with a regular frost season (state median 211 days).
- The last frost is 10 days earlier than the zone 7a median of Apr 16. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 7a chart.
- The weather station records an average of 85 nights a year at or below 32°F.
- Hillsdale shares its weather station with Enid, OK, 23 km away, so the two have the same frost dates.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 20 |
| 50% (median) | April 6 |
| 10% (safe for tender plants) | April 21 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 21 |
| 50% (median) | November 1 |
| 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 Hillsdale, OK
Hillsdale, OK frost dates — last frost Apr 6, first frost Nov 1, zone 7a. 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 Hillsdale, OK
| 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 Enid, OK weather station, 19 km away (elevation 1,247 ft (380 m)).
Frost dates near Hillsdale
- Carrier Apr 10 · Oct 31
- Kremlin Apr 6 · Nov 1
- Goltry Apr 9 · Oct 31
- Nash Apr 5 · Nov 1
- Pond Creek Apr 18 · Oct 20
- Lahoma Apr 10 · Oct 31
- Jet Apr 5 · Nov 1
- Enid Apr 6 · Nov 1
- Meno Apr 10 · Oct 31
- Helena Apr 9 · Oct 31
Frequently asked questions
When is the last frost in Hillsdale, OK?
The median last spring frost in Hillsdale, OK is April 6. There is still about a 10% chance of frost after April 21, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Hillsdale, OK?
The median first fall frost is November 1, with about a 10% chance of frost before October 21.
How long is the growing season in Hillsdale, OK?
About 209 days between the median last spring frost and first fall frost.
What planting zone is Hillsdale, OK?
Hillsdale, OK is in USDA hardiness zone 7a.