USDA Zone 7b — Garden & Frost Dates for Oklahoma City, OK (73139)
This is the local garden report for ZIP code 73139 (Oklahoma City, OK). It pairs the official USDA 2023 hardiness zone with NOAA-based frost dates so you can plan seeds, transplants, and fall crops with real numbers for your neighborhood.
What does zone 7b mean for Oklahoma City?
Zone 7b is the USDA Plant Hardiness Zone for ZIP 73139, based on the 30-year (1991-2020) average annual extreme minimum winter temperature. Perennial plants labeled for zone 7b or lower should survive a typical winter here. The last spring frost averages 03-28 and the first fall frost averages 11-01, giving roughly 218 frost-free growing days — the window that most vegetables need to go from seed to harvest.
Start your Oklahoma City planting calendar
This calendar is pre-loaded with the exact frost dates for ZIP 73139 (Oklahoma City, OK) — more precise than a state-wide average. Pick a crop and print the plan.
In this ZIP (typical zone 6–8), last frost ≈ Mar 28, first frost ≈ Nov 1 (218-day season), your Tomato plan:
Month-by-month (this ZIP, 2026)
| Month | Action |
|---|---|
| Jan | — |
| Feb | Start indoors |
| Mar | — |
| Apr | Sow · Transplant |
| May | — |
| Jun | Harvest |
| Jul | — |
| Aug | — |
| Sep | — |
| Oct | — |
| Nov | — |
| Dec | — |
Start indoors 6 weeks before last frost; transplant after soil warms. Zones 3–13 suitable. Dates are typical; confirm with your county extension and watch the 10-day forecast.
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