Miami, OK planting calendar
- USDA zone
- 7a0 to 5 °F
- Last frost
- Apr 6avg, 32°F
- First frost
- Oct 27avg, 32°F
- Growing season
- 203days
Miami, Oklahoma is in USDA plant hardiness zone 7a. Its average last spring frost is around April 6 and the first fall frost around October 27, giving a growing season of about 203 days (NOAA 1991–2020 normals, 32°F, median). Start tender crops like tomatoes and peppers indoors weeks before the last frost and set them out afterward; sow hardy crops such as peas, spinach, and lettuce before it. The planner below turns those frost dates into a printable per-crop planting calendar.
Miami planting calendar
Each crop's windows are counted from Miami's average frost dates. hatched = start seeds indoors, solid green = plant out, teal = a fall sowing, and the terracotta dot marks the estimated first harvest. Ranges are extension-guide planning guidance, not guarantees.
- Start indoors
- Plant out
- Fall sowing
- First harvest
| Crop | Frost tolerance | Start indoors | Plant out | First harvest | Fall planting |
|---|---|---|---|---|---|
| Tomato | Tender | Feb 9 – Feb 23 | Apr 13 – Apr 20 | Jun 12 – Jul 2 | — |
| Pepper | Very tender | Jan 26 – Feb 9 | Apr 20 – Apr 27 | Jun 19 – Jul 19 | — |
| Cucumber | Tender | Mar 9 – Mar 16 | Apr 13 – Apr 20 | Jun 2 – Jun 22 | — |
| Summer squash / zucchini | Tender | — | Apr 13 – Apr 20 | May 28 – Jun 12 | — |
| Bush bean | Tender | — | Apr 13 – Apr 20 | Jun 2 – Jun 12 | Aug 28 – Sep 7 |
| Sweet corn | Tender | — | Apr 6 – Apr 20 | Jun 5 – Jul 5 | — |
| Basil | Very tender | Feb 23 – Mar 9 | Apr 13 – Apr 20 | May 13 – May 28 | — |
| Lettuce | Half-hardy | Feb 23 – Mar 9 | Mar 9 – Mar 23 | Apr 23 – May 8 | Aug 14 – Aug 29 |
| Pea | Hardy | — | Feb 23 – Mar 9 | Apr 19 – May 4 | Aug 4 – Aug 19 |
| Spinach | Hardy | — | Feb 23 – Mar 9 | Apr 4 – Apr 14 | Aug 24 – Sep 3 |
| Carrot | Half-hardy | — | Mar 16 – Mar 23 | May 15 – Jun 4 | Jul 25 – Aug 14 |
| Broccoli | Half-hardy | Feb 9 – Feb 23 | Mar 9 – Mar 23 | May 3 – May 23 | Jul 30 – Aug 19 |
Data: NOAA NCEI U.S. Climate Normals 1991–2020 (public domain) and USDA Plant Hardiness Zone Map 2023. Planting windows synthesized from U.S. Cooperative Extension guides.
Frost & freeze dates
From NOAA's 1991–2020 Climate Normals at station USC00345855. The median (p50) is the average date; the 90%-safe column is the date the freeze has passed in about 9 years out of 10 (p10 for spring, p90 for fall) — the conservative date to plant after or harvest before.
| Threshold | Last spring — avg | Last spring — 90%-safe | First fall — avg | First fall — 90%-safe | Season (days) |
|---|---|---|---|---|---|
| 36°F | Apr 19 | May 5 | Oct 19 | Oct 31 | 181 |
| 32°F (freeze) | Apr 6 | Apr 26 | Oct 27 | Nov 10 | 203 |
| 28°F | Mar 25 | Apr 10 | Nov 5 | Nov 24 | 227 |
| 24°F | Mar 11 | Mar 31 | Nov 16 | Dec 6 | 250 |
32°F is the standard "freeze" line that damages tender crops; lighter 36°F frost can nip the most cold-sensitive plants, while hardy crops shrug off light frost down toward 28°F. Use the threshold that matches what you are protecting.
Growing degree days
Growing degree days (GDD) accumulate warmth above a base temperature over the year — a better predictor of crop development than the calendar alone. Warm-season crops need a long, warm GDD total; a short, cool GDD total favors greens and brassicas.
| Model | °F·days | Used for |
|---|---|---|
| Base 50°F (warm-season) | 4,661 | standard warm-season base (tomato, corn, beans) |
| Base 40°F (cool-season) | 7,381 | cool-season crops (brassicas, greens) |
Hardiness zone 7a
Miami sits in USDA plant hardiness zone 7a on the 2023 map — meaning its average annual extreme minimum winter temperature is about 0 to 5 °F. That number tells you which perennials, shrubs, and trees reliably survive an average winter here; it does not set your planting dates, which come from the frost calendar above.
Explore more places in zone 7a, or see all USDA hardiness zones.
Frequently asked questions
- What USDA hardiness zone is Miami?
- Miami, Oklahoma is in USDA plant hardiness zone 7a on the 2023 map (average annual extreme minimum temperature 0 to 5 °F) — from the USDA Plant Hardiness Zone Map 2023, matched to this location's ZIP. See the methodology page for sources.
- When is the last frost in Miami?
- The average (median) last spring frost at 32°F is around April 6, from NOAA's 1991–2020 climate normals at the nearest reporting station. Roughly one year in ten the last frost is as late as April 26, so wait until then before setting out frost-tender plants if you want to be safe.
- When is the first fall frost in Miami?
- The average first fall frost at 32°F is around October 27. That leaves a growing season of about 203 days between the average last spring and first fall frosts.
- When should I start tomatoes in Miami?
- Start tomato seeds indoors about Feb 9 – Feb 23 and transplant them outside about Apr 13 – Apr 20, once the danger of frost has passed. Estimated first harvest is around Jun 12 – Jul 2.
- How long is the growing season in Miami?
- About 203 days at the 32°F threshold (NOAA 1991–2020, median) — the span between the average last spring frost (~April 6) and the average first fall frost (~October 27). Cold-hardy crops extend usable time at both ends; frost-tender crops fit inside it.
Sources & method
Frost, freeze, growing-season, and growing-degree-day figures are NOAA NCEI U.S. Climate Normals 1991–2020 for station USC00345855 (Miami, 0.7 km away). The hardiness zone is the USDA Plant Hardiness Zone Map 2023, matched to this location's ZIP. Planting windows are computed by counting from the average last and first frost using per-crop offsets synthesized from U.S. Cooperative Extension guides — the full method and citations are on the methodology page.