Hardiness zone 9a · 77 stations
Zone 9a Frost Dates: Typical Last Frost Mar 10
Summary across 77 NOAA weather stations whose location falls in zone 9a*. Dates are the typical (50% chance) frost dates of each station; the table shows the spread between stations.
- Typical last frostMarch 10median station, 50% chance
- Typical first fall frostNovember 21median station, 50% chance
- Frost-free season257 daysmedian station
- Weather stations77dates differ by weeks inside a zone
| 25% of stations | Median station | 75% of stations | |
|---|---|---|---|
| Last frost in spring (32°F) | March 4 | March 10 | March 26 |
| First frost in fall (32°F) | November 15 | November 21 | November 25 |
| Frost-free days | 233 | 257 | 266 |
Frost dates inside one zone differ by weeks: the zone describes winter cold, not the length of the season. Use the station closest to you.
Stations in zone 9a
| Station | Zone | Last spring frost (50%) | First fall frost (50%) | Frost-free days |
|---|---|---|---|---|
| Aberdeen, WA | 9a | March 29 | November 15 | 234 |
| Albany, GA | 9a | March 10 | November 20 | 257 |
| Alexandria, LA | 9a | February 27 | November 27 | 274 |
| Astoria, OR | 9a | March 26 | November 11 | 232 |
| Auberry, CA | 9a | March 25 | December 3 | 253 |
| Bay Minette, AL | 9a | February 28 | November 25 | 272 |
| Boyce, LA | 9a | March 2 | November 27 | 271 |
| Brenham, TX | 9a | March 2 | November 30 | 273 |
| Brooklet, GA | 9a | March 7 | November 21 | 257 |
| Bunkie, LA | 9a | February 28 | November 24 | 270 |
| Camilla, GA | 9a | March 10 | November 18 | 254 |
| Campo, CA | 9a | April 30 | October 26 | 174 |
| Carrizo Springs, TX | 9a | March 5 | November 22 | 265 |
| Charleston, SC | 9a | March 7 | November 27 | 266 |
| Chipley, FL | 9a | March 5 | November 21 | 263 |
| College Station, TX | 9a | February 27 | November 30 | 278 |
| Columbia, MS | 9a | March 5 | November 19 | 262 |
| Columbus, TX | 9a | March 9 | November 20 | 255 |
| Cushman Powerhouse #2, WA | 9a | March 24 | November 15 | 235 |
| Del Rio, TX | 9a | February 16 | December 3 | 293 |
| Elgin, TX | 9a | March 4 | November 24 | 264 |
| Estacada, OR | 9a | March 27 | November 14 | 230 |
| Fairhope, AL | 9a | March 10 | November 17 | 253 |
| Fort Stewart, GA | 9a | March 5 | November 29 | 269 |
| Graton, CA | 9a | March 20 | November 13 | 240 |
| Jasper, FL | 9a | March 11 | November 22 | 258 |
| Jerome, AZ | 9a | March 26 | November 25 | 242 |
| Kent, WA | 9a | March 20 | November 10 | 233 |
| King City, CA | 9a | February 23 | November 22 | 271 |
| Leaburg, OR | 9a | April 3 | November 11 | 220 |
| Lexington, TX | 9a | March 5 | November 21 | 262 |
| Long Beach, WA | 9a | April 6 | October 26 | 200 |
| Lufkin, TX | 9a | March 11 | November 15 | 247 |
| Luling, TX | 9a | March 5 | November 23 | 263 |
| Mayo, FL | 9a | March 8 | November 25 | 264 |
| Mobile, AL | 9a | March 3 | November 25 | 268 |
| Mount Hamilton, CA | 9a | May 3 | November 18 | 197 |
| Nevada City, CA | 9a | April 14 | November 20 | 218 |
| Niceville, FL | 9a | March 12 | November 19 | 253 |
| Orange, TX | 9a | February 28 | November 23 | 273 |
| Otis, OR | 9a | April 4 | November 16 | 227 |
| Overton, NV | 9a | February 26 | November 22 | 268 |
| Paso Robles, CA | 9a | March 15 | November 10 | 238 |
| Paso Robles (Airport), CA | 9a | April 4 | November 5 | 213 |
| Perry, FL | 9a | March 4 | November 26 | 267 |
| Poplarville, MS | 9a | March 10 | November 21 | 257 |
| Portland, OR | 9a | March 13 | November 19 | 247 |
| Quillayute State Airport, WA | 9a | April 20 | October 26 | 190 |
| Redding, CA | 9a | March 3 | November 21 | 261 |
| Riddle, OR | 9a | March 31 | November 6 | 221 |
| Robertsdale, AL | 9a | March 5 | November 23 | 264 |
| San Marcos, TX | 9a | February 28 | November 29 | 273 |
| Sandberg, CA | 9a | April 15 | November 26 | 224 |
| Sasabe, AZ | 9a | March 21 | November 20 | 246 |
| Savannah, GA | 9a | March 2 | November 30 | 270 |
| Seattle (Seattle-Tacoma Airport), WA | 9a | March 2 | November 23 | 266 |
| Slidell, LA | 9a | March 3 | November 21 | 263 |
| Smithville, TX | 9a | March 12 | November 19 | 251 |
| Sonora, CA | 9a | April 9 | November 9 | 213 |
| Tallahassee, FL | 9a | March 11 | November 21 | 255 |
| Tifton, GA | 9a | March 11 | November 19 | 254 |
| Tombstone, AZ | 9a | March 4 | November 29 | 264 |
| Town Bluff Dam, TX | 9a | March 9 | November 22 | 258 |
| near Aguanga, CA | 9a | April 29 | November 18 | 201 |
| near Barstow, CA | 9a | February 19 | November 26 | 279 |
| near Canyon Lake, TX | 9a | March 1 | December 1 | 276 |
| near Coquille, OR | 9a | March 28 | November 6 | 225 |
| near Corcoran, CA | 9a | February 15 | November 27 | 285 |
| near Grass Valley, CA | 9a | April 10 | November 13 | 215 |
| near Hoquiam, WA | 9a | March 30 | November 14 | 228 |
| near Jonesville, LA | 9a | March 6 | November 22 | 261 |
| near Kirkland, WA | 9a | March 8 | November 23 | 259 |
| near Lowell, OR | 9a | March 7 | November 27 | 263 |
| near Redwood Valley, CA | 9a | April 8 | November 6 | 211 |
| near Roseburg, OR | 9a | March 23 | November 18 | 237 |
| near Tacoma, WA | 9a | March 8 | November 14 | 250 |
Sources
- NOAA NCEI U.S. Climate Normals 1991–2020
- PRISM Group, Oregon State University — 2023 USDA Plant Hardiness Zone GIS datasets
* zone derived from PRISM 2023 grid at the station location (not the official USDA map). Source data: PRISM Group, Oregon State University.