USDA zone 7b in Oklahoma
USDA plant hardiness zone 7b covers 77 locations across Oklahoma (average annual extreme minimum 5 to 10 °F): Altus, OK, Anadarko, OK, Atwood, OK, Bessie, OK, Bunch, OK, Byars, OK, and 71 more. Average last spring frost across this group ranges March 23 (Fanshawe) to April 14 (Watonga), and growing seasons run 194–229 days (Watonga to Okemah) — even within one state, because hardiness sets winter survival, not planting dates. The table below gives every Oklahoma location's own frost dates; the printable planting calendar uses Seminole, this group's median-season location.
- USDA zone
- 7b5 to 10 °F
- Last frost range
- Mar 23–Apr 14avg, 32°F
- First frost range
- Oct 25–Nov 9avg, 32°F
- Growing season range
- 194–229days
Locations in this group
Every location below shares this zone and a nearby weather station, but keeps its own frost dates — find your town for its own numbers, or use the ZIP planner on the home page for an instant personalized answer.
| Location | Also covers | Nearest station | Last frost | First frost | Season (days) |
|---|---|---|---|---|---|
| Altus | Olustee, Elmer, Headrick | Altus Irig Rsch Stn | Apr 5 | Nov 2 | 210 |
| Anadarko | Pocasset, Apache, Binger, Sterling, Cyril, Cement, +2 more | Anadarko 3 E | Apr 8 | Oct 30 | 202 |
| Atwood | — | Holdenville 2sse | Apr 6 | Oct 31 | 206 |
| Bessie | — | Bessie 4wnw Mesonet | Apr 3 | Nov 1 | 210 |
| Bunch | Cookson, Box, Badger Lee, Marble, Gans | Sallisaw 2 Nw | Mar 30 | Nov 7 | 223 |
| Byars | Stratford, Wanette | Byars 3ese Mesonet | Mar 25 | Nov 8 | 228 |
| Calumet | — | El Reno 5 Wnw Mesonet | Apr 12 | Oct 27 | 196 |
| Carnegie | Eakly | Carnegie 5 Ne | Apr 6 | Oct 31 | 206 |
| Chickasha | Ninnekah | Chickasha Exp Station | Apr 4 | Nov 1 | 211 |
| Christie | Stilwell | Stilwell 5 Nnw | Mar 31 | Nov 4 | 217 |
| Clarita | Allen, Cottonwood, Stonewall, Tupelo, Gerty, Centrahoma | Centrahoma 2 Ese | Mar 31 | Nov 4 | 219 |
| Clinton | Arapaho | Clinton | Apr 13 | Oct 28 | 197 |
| Connerville | Bromide | Tishomingo 6n Mesonet | Mar 29 | Nov 5 | 222 |
| Cushing | Agra | Cushing | Apr 1 | Nov 5 | 217 |
| Custer | — | Putnam 3n Mesonet | Apr 8 | Nov 1 | 204 |
| Davis | Sulphur, Wynnewood, Roff, Mill Creek | Chickasaw Nra | Apr 4 | Oct 31 | 208 |
| Drumright | Lawrence Creek, Prue, Lotsee | Mannford 6 Nw | Apr 6 | Oct 29 | 207 |
| Edmond | Luther, Meridian, Seward | Guthrie 5s | Apr 10 | Oct 28 | 199 |
| El Reno | — | El Reno 1 N | Apr 6 | Oct 31 | 206 |
| Elk | Sayre, Canute, Carter | Elk City 4 W | Apr 5 | Nov 2 | 208 |
| Fanshawe | Lequire, Stigler, Shady Point, Whitefield, Le Flore, McCurtain, +3 more | Mc Curtain 1 Se | Mar 23 | Nov 5 | 228 |
| Fitzhugh | Latta, Fittstown, Francis, Sasakwa | Ada | Apr 2 | Nov 4 | 217 |
| Fort Cobb | — | Fort Cobb 4nnw Mesonet | Apr 5 | Nov 3 | 210 |
| Foster | Lindsay, Bradley | Lindsay 2 W | Apr 13 | Oct 27 | 196 |
| Geary | — | Geary | Apr 6 | Nov 5 | 212 |
| Granite | Lone Wolf, Blair, Martha | Altus Dam | Apr 2 | Nov 3 | 213 |
| Gregory | Mazie | Claremore 2 Ene | Apr 7 | Oct 30 | 205 |
| Guthrie | Cashion, Coyle | Guthrie Muni Ap | Apr 3 | Nov 1 | 211 |
| Hinton | Lookeba | Hinton 7w Mesonet | Apr 5 | Nov 1 | 208 |
| Hobart | Gotebo, Mountain View, Roosevelt | Hobart Muni Ap | Apr 4 | Nov 4 | 214 |
| Hochatown | Whitesboro, Smithville | Battiest | Apr 13 | Oct 27 | 196 |
| Holdenville | — | Holdenville 3ese Mesonet | Mar 29 | Nov 5 | 221 |
| Hollis | Eldorado, East Duke, Gould | Hollis 5e | Apr 10 | Oct 28 | 200 |
| Kingfisher | Okarche | Kingfisher | Apr 8 | Nov 1 | 206 |
| Lawton | Medicine Park, Geronimo, Sterling, Lakeside, Faxon | Lawton Muni Ap | Apr 1 | Nov 5 | 217 |
| Lehigh | — | Atoka | Apr 5 | Nov 1 | 211 |
| Lost | Fort Gibson, Pettit, Whitehorn Cove, Haskell, Taft, Redbird, +2 more | Muskogee | Apr 7 | Oct 30 | 208 |
| Mangum | Willow | Mangum | Apr 8 | Nov 2 | 207 |
| Marlow | — | Duncan | Mar 25 | Nov 7 | 225 |
| McAlester | Lamar, Eufaula, Krebs, Hartshorne, Crowder, Savanna, +11 more | Mcalester Rgnl Ap | Mar 31 | Nov 3 | 216 |
| McLoud | — | Shawnee 3nnw Mesonet | Mar 30 | Nov 5 | 221 |
| New Cordell | Burns Flat, Foss, Sentinel, Dill, Rocky | Clinton Sherman Ap | Apr 5 | Nov 4 | 210 |
| Norman | Newcastle, Slaughterville, Goldsby, Washington | Norman 3sse | Apr 3 | Nov 3 | 212 |
| Okemah | Welty, Wetumka, Boley, Weleetka, Dustin | Okemah | Mar 24 | Nov 9 | 229 |
| Oklahoma | Norman | Norman 2nw Mesonet | Mar 31 | Nov 5 | 219 |
| Oklahoma | Jones | Spencer 2ene Mesonet | Apr 2 | Nov 5 | 217 |
| Oklahoma | Piedmont, Yukon, The | Oklahoma City Post Ap | Apr 2 | Nov 4 | 216 |
| Oklahoma | Newcastle, Mustang | Oklahoma City Will Rogers Ap | Apr 4 | Nov 2 | 213 |
| Okmulgee | Morris, Dewar, Schulter, Preston | Okmulgee Wtr Wks | Apr 8 | Oct 28 | 203 |
| Pauls Valley | Maysville, Elmore, Wayne, Paoli | Pauls Valley 4 Wsw | Apr 5 | Nov 1 | 210 |
| Peggs | Cedar Crest | Spavinaw | Apr 7 | Nov 2 | 209 |
| Perkins | — | Stillwater Rgnl Ap | Apr 3 | Oct 31 | 209 |
| Poteau | Fanshawe, Howe, Monroe, Hodgen | Wister 3s | Apr 6 | Nov 2 | 210 |
| Pumpkin Hollow | Caney, Grandview | Tahlequah | Apr 4 | Oct 31 | 209 |
| River Bottom | Checotah, Notchietown, Warner, Rentiesville, Summit, Boynton, +4 more | Muskogee Davis Fld | Apr 2 | Nov 2 | 216 |
| Rush Springs | — | Acme Mesonet | Apr 4 | Oct 31 | 210 |
| Seminole * | St. Louis, Earlsboro, Bowlegs, Brooksville, Konawa, Maud, +5 more | Seminole | Apr 5 | Nov 1 | 210 |
| Shawnee | Choctaw, McLoud, Harrah, Prague, Meeker, Wellston, +1 more | Meeker 5 W | Apr 4 | Oct 30 | 208 |
| Slick | Bristow, Kellyville, Depew, Shamrock | Bristow | Apr 9 | Oct 25 | 196 |
| Smithville | — | Smithville | Apr 9 | Oct 29 | 201 |
| Snyder | Mountain Park | Wichita Mtn Wr | Mar 28 | Nov 6 | 224 |
| Spiro | Liberty, Panama, Cameron, Huntington, Midland | Ft Smith Rgnl Ap | Mar 25 | Nov 6 | 224 |
| Stringtown | — | Mcgee Creek Dam | Mar 27 | Nov 9 | 228 |
| Stroud | Chandler, Tryon, Carney, Davenport | Chandler | Apr 7 | Oct 30 | 205 |
| Sweetwater | Texola | Erick | Apr 11 | Oct 26 | 197 |
| Tipton | — | Tipton 4s Mesonet | Apr 3 | Nov 6 | 217 |
| Tulsa | Sand Springs, Owasso, Fair Oaks, Turley, Sperry, Avant | Tulsa Intl Ap | Mar 31 | Nov 4 | 220 |
| Tulsa | Bixby, Sapulpa, Jenks, Glenpool, Liberty, Oakhurst, +2 more | Tulsa R L Jones Jr Ap | Mar 30 | Nov 4 | 220 |
| Tulsa | Broken Arrow, Coweta | Bixby | Apr 1 | Nov 1 | 212 |
| Tuskahoma | Clayton, Talihina, Nashoba, Albion | Tuskahoma | Apr 11 | Oct 27 | 199 |
| Tuttle | Dibble, Alex, Amber, Middleberg | Blanchard 2 Ssw | Apr 3 | Nov 4 | 214 |
| Union | Minco | Minco 2ssw Mesonet | Apr 3 | Nov 5 | 216 |
| Wagoner | — | Wagoner | Mar 29 | Nov 5 | 223 |
| Watonga | Thomas, Canton, Fay, Greenfield, Loyal | Watonga | Apr 14 | Oct 27 | 194 |
| Weatherford | Colony, Hydro, Corn | Weatherford | Apr 3 | Nov 3 | 214 |
| Webbers Falls | Porum | Webbers Falls 5 Wsw | Apr 6 | Oct 30 | 206 |
| Wilburton | Red Oak | Wilburton 9 Ene | Apr 2 | Nov 5 | 218 |
* Seminole is this group's median-season location — the calendar below is computed from its data.
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.
Planting calendar (Seminole, representative)
Computed from Seminole's average frost dates — the median-season location in this Oklahomazone 7b group. 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 — your own location's dates may run a week or two earlier or later (see the table above).
- Start indoors
- Plant out
- Fall sowing
- First harvest
| Crop | Frost tolerance | Start indoors | Plant out | First harvest | Fall planting | Season fit |
|---|---|---|---|---|---|---|
| Tomato | Tender | Feb 8 – Feb 22 | Apr 12 – Apr 19 | Jun 11 – Jul 1 | — | matures comfortably |
| Pepper | Very tender | Jan 25 – Feb 8 | Apr 19 – Apr 26 | Jun 18 – Jul 18 | — | matures comfortably |
| Cucumber | Tender | Mar 8 – Mar 15 | Apr 12 – Apr 19 | Jun 1 – Jun 21 | — | matures comfortably |
| Summer squash / zucchini | Tender | — | Apr 12 – Apr 19 | May 27 – Jun 11 | — | matures comfortably |
| Bush bean | Tender | — | Apr 12 – Apr 19 | Jun 1 – Jun 11 | Sep 2 – Sep 12 | matures comfortably |
| Sweet corn | Tender | — | Apr 5 – Apr 19 | Jun 4 – Jul 4 | — | matures comfortably |
| Basil | Very tender | Feb 22 – Mar 8 | Apr 12 – Apr 19 | May 12 – May 27 | — | matures comfortably |
| Lettuce | Half-hardy | Feb 22 – Mar 8 | Mar 8 – Mar 22 | Apr 22 – May 7 | Aug 19 – Sep 3 | matures comfortably |
| Pea | Hardy | — | Feb 22 – Mar 8 | Apr 18 – May 3 | Aug 9 – Aug 24 | matures comfortably |
| Spinach | Hardy | — | Feb 22 – Mar 8 | Apr 3 – Apr 13 | Aug 29 – Sep 8 | matures comfortably |
| Carrot | Half-hardy | — | Mar 15 – Mar 22 | May 14 – Jun 3 | Jul 30 – Aug 19 | matures comfortably |
| Broccoli | Half-hardy | Feb 8 – Feb 22 | Mar 8 – Mar 22 | May 2 – May 22 | Aug 4 – Aug 24 | matures comfortably |
Which crops fit this growing season
Using Seminole's own 210-day growing season (32°F, NOAA 1991–2020 median) against each crop's real days-to-maturity range: 12 of 12 crops mature here with comfortable margin. A different location in the table above with a longer or shorter season will get a different mix — the ZIP planner on the home page gives your own.
Frost & freeze dates (Seminole)
From NOAA's 1991–2020 Climate Normals at station USC00348042. 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 — 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 16 | Apr 30 | Oct 24 | Nov 7 | 191 |
| 32°F (freeze) | Apr 5 | Apr 22 | Nov 1 | Nov 15 | 210 |
| 28°F | Mar 24 | Apr 10 | Nov 9 | Nov 27 | 232 |
| 24°F | Mar 11 | Mar 30 | Nov 20 | Dec 8 | 254 |
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. This group's median GDD (base 50°F) across all 77 locations is 5,148; Seminole's own reading is shown below.
| Model | °F·days | Used for |
|---|---|---|
| Base 50°F (warm-season) | 5,242 | standard warm-season base (tomato, corn, beans) |
| Base 40°F (cool-season) | 8,119 | cool-season crops (brassicas, greens) |
Hardiness zone 7b in Oklahoma
Zone 7b means an average annual extreme minimum winter temperature of about 5 to 10 °F on the USDA's 2023 map — the number that 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. Oklahoma spans 4 hardiness zones in this dataset — see all Oklahoma locations for the full range, including zones6b, 7a, 8a.
Explore zone 7b in other states at zone 7b, or see all USDA hardiness zones.
Frequently asked questions
- What does USDA hardiness zone 7b mean in Oklahoma?
- Zone 7b means an average annual extreme minimum winter temperature of 5 to 10 °F — the standard USDA measure of which perennials survive winter. 77 locations in Oklahoma fall in this zone. It does not set planting dates; see the frost calendar below for that.
- Where in Oklahoma's zone 7b is the growing season longest?
- Okemah runs the longest season on this page at about 229 days; Watonga is shortest at about 194 days — they share the same hardiness zone, but they sit at different weather stations, so their frost calendars differ.
- When should I plant tomatoes in Oklahoma's zone 7b?
- Using Seminole's frost dates (this page's median-season location): start seeds indoors about Feb 8 – Feb 22, then transplant outside about Apr 12 – Apr 19. Your own location in the table above may differ by a week or two — use the ZIP planner on the home page for your exact station's dates.
- Does every location in Oklahoma's zone 7b have the same frost dates?
- No — they do not all share a weather station, so frost dates vary by a week or more across the 77 locations listed (see the table above for each location's own dates).
Sources & method
Frost, freeze, growing-season, and growing-degree-day figures are NOAA NCEI U.S. Climate Normals 1991–2020, one reading per location's own nearest station (see the table above). The hardiness zone is the USDA Plant Hardiness Zone Map 2023, matched to each 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.