Frost dates for 73071 — Norman, OK
Last spring frostMar 31median date
First fall frostNov 5median date
Growing season219 daysfrost-free
Hardiness zone7bZone 7b
How Norman compares
- In 8 years out of 10, the last spring frost in Norman falls between March 12 and April 17, a 36-day window. The first fall frost falls between October 21 and November 19.
- The median last frost is 4 days earlier than the Oklahoma median of Apr 4.
- Its 219-day growing season is longer than 79% of the 582 Oklahoma places with a regular frost season (state median 211 days).
- The last frost is 5 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 72 nights a year at or below 32°F.
- Compared with Oklahoma City, OK, 30 km away, the last frost here is 2 days earlier than there and the growing season is 2 days longer.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 12 |
| 50% (median) | March 31 |
| 10% (safe for tender plants) | April 17 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 21 |
| 50% (median) | November 5 |
| 90% (late) | November 19 |
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 Norman, OK
Frost dates for 73071 — Norman, OK — last frost Mar 31, first frost Nov 5, zone 7b. whenisthelastfrost.com
Crop
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Start indoors: Jan 6 to Jan 20Transplant outside: Mar 3 to Mar 17
Start indoors: Jan 20 to Feb 3Transplant outside: Apr 14 to Apr 28
Start indoors: Jan 20 to Feb 3Transplant outside: Apr 14 to Apr 28
Start indoors: Feb 3 to Feb 17Transplant outside: Apr 7 to Apr 21
Start indoors: Feb 3 to Feb 17Transplant outside: Mar 10 to Mar 24Sow outdoors: Mar 3 to Apr 7Plant for fall: Sep 10 to Oct 8
Start indoors: Feb 3 to Feb 17Transplant outside: Mar 3 to Mar 17Sow outdoors: Mar 3 to Mar 17Plant for fall: Aug 27 to Sep 17
Start indoors: Feb 3 to Feb 17Transplant outside: Mar 17 to Mar 31Plant for fall: Jul 30 to Aug 20
Start indoors: Feb 3 to Feb 17Transplant outside: Mar 10 to Mar 24Plant for fall: Jul 30 to Aug 20
Start indoors: Feb 3 to Feb 17Transplant outside: Mar 17 to Mar 31Plant for fall: Jul 30 to Aug 20
Start indoors: Feb 17 to Mar 3Transplant outside: Apr 21 to May 5Sow outdoors: Apr 21 to May 5
Start indoors: Feb 17 to Mar 3Transplant outside: Apr 7 to Apr 21
Sow outdoors: Feb 17 to Mar 10Plant for fall: Aug 13 to Sep 3
Sow outdoors: Feb 17 to Mar 10Plant for fall: Sep 10 to Oct 1
Sow outdoors: Feb 24 to Apr 7Plant for fall: Sep 24 to Oct 15
Start indoors: Mar 3 to Mar 10Transplant outside: Apr 14 to Apr 21Sow outdoors: Apr 7 to Apr 21Plant for fall: Aug 20 to Sep 3
Start indoors: Mar 3 to Mar 10Sow outdoors: Apr 7 to Apr 21Plant for fall: Aug 27 to Sep 10
Start indoors: Mar 3 to Mar 10Sow outdoors: Apr 7 to Apr 21
Start indoors: Mar 3 to Mar 10Transplant outside: Apr 14 to Apr 28
Sow outdoors: Mar 10 to Apr 7Plant for fall: Aug 13 to Aug 27
Sow outdoors: Mar 10 to Apr 7Plant for fall: Aug 27 to Sep 10
Sow outdoors: Mar 10 to Mar 31
Sow outdoors: Mar 17 to Apr 14Plant for fall: Aug 27 to Sep 10
Sow outdoors: Mar 17 to Apr 7Plant for fall: Sep 10 to Oct 1
Sow outdoors: Apr 7 to Apr 28Plant for fall: Aug 20 to Sep 3
Sow outdoors: Apr 7 to Apr 21
Transplant outside: Apr 14 to May 5
Plant for fall: Oct 22 to Nov 26
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Norman, OK
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 6 – Jan 20 | Mar 3 – Mar 17 | — | — |
| Peppers | Jan 20 – Feb 3 | Apr 14 – Apr 28 | — | — |
| Eggplant | Jan 20 – Feb 3 | Apr 14 – Apr 28 | — | — |
| Tomatoes | Feb 3 – Feb 17 | Apr 7 – Apr 21 | — | — |
| Lettuce | Feb 3 – Feb 17 | Mar 10 – Mar 24 | Mar 3 – Apr 7 | Sep 10 – Oct 8 |
| Kale | Feb 3 – Feb 17 | Mar 3 – Mar 17 | Mar 3 – Mar 17 | Aug 27 – Sep 17 |
| Broccoli | Feb 3 – Feb 17 | Mar 17 – Mar 31 | — | Jul 30 – Aug 20 |
| Cabbage | Feb 3 – Feb 17 | Mar 10 – Mar 24 | — | Jul 30 – Aug 20 |
| Cauliflower | Feb 3 – Feb 17 | Mar 17 – Mar 31 | — | Jul 30 – Aug 20 |
| Okra | Feb 17 – Mar 3 | Apr 21 – May 5 | Apr 21 – May 5 | — |
| Basil | Feb 17 – Mar 3 | Apr 7 – Apr 21 | — | — |
| Peas | — | — | Feb 17 – Mar 10 | Aug 13 – Sep 3 |
| Spinach | — | — | Feb 17 – Mar 10 | Sep 10 – Oct 1 |
| Radishes | — | — | Feb 24 – Apr 7 | Sep 24 – Oct 15 |
| Cucumbers | Mar 3 – Mar 10 | Apr 14 – Apr 21 | Apr 7 – Apr 21 | Aug 20 – Sep 3 |
| Zucchini & Summer Squash | Mar 3 – Mar 10 | — | Apr 7 – Apr 21 | Aug 27 – Sep 10 |
| Winter Squash & Pumpkins | Mar 3 – Mar 10 | — | Apr 7 – Apr 21 | — |
| Melons & Watermelon | Mar 3 – Mar 10 | Apr 14 – Apr 28 | — | — |
| Carrots | — | — | Mar 10 – Apr 7 | Aug 13 – Aug 27 |
| Beets | — | — | Mar 10 – Apr 7 | Aug 27 – Sep 10 |
| Potatoes | — | — | Mar 10 – Mar 31 | — |
| Swiss Chard | — | — | Mar 17 – Apr 14 | Aug 27 – Sep 10 |
| Cilantro | — | — | Mar 17 – Apr 7 | Sep 10 – Oct 1 |
| Green Beans | — | — | Apr 7 – Apr 28 | Aug 20 – Sep 3 |
| Sweet Corn | — | — | Apr 7 – Apr 21 | — |
| Sweet Potatoes | — | Apr 14 – May 5 | — | — |
| Garlic | — | — | — | Oct 22 – Nov 26 |
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 Norman 2nw Mesonet, OK weather station, 5 km away (elevation 1,181 ft (360 m)).
ZIP codes in Norman: 73019 73026 73069 73070 73071 73072
Frost dates near Norman
- Noble Apr 3 · Nov 3
- Washington Apr 3 · Nov 3
- Newcastle Mar 31 · Nov 5
- Newalla Mar 30 · Nov 5
- Blanchard Apr 3 · Nov 4
- Purcell Apr 4 · Nov 2
- Lexington Apr 4 · Nov 2
- Wheatland Apr 4 · Nov 2
Frequently asked questions
When is the last frost in Norman, OK?
The median last spring frost in Norman, OK is March 31. 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 Norman, OK?
The median first fall frost is November 5, with about a 10% chance of frost before October 21.
How long is the growing season in Norman, OK?
About 219 days between the median last spring frost and first fall frost.
What planting zone is Norman, OK?
Norman, OK is in USDA hardiness zone 7b.