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Frost Dates




This table shows the average last frost in spring, the first frost in autumn and the length of the growing season for selected U.S. cities.


Alabama      
Birmingham Mar 29 Nov 6 221 days
Mobile Feb 27 Nov 26 272 days
Alaska      
Junesu May 16 Sep 28 133 days
Arizona      
Flagstaff Jun 13 Sep 21 99 days
Phoenix Feb 5 Dec 15 308 days
Tucson Feb 28 Nov 29 273 days
Arkansas      
Fayetteville April 21 Oct 17 179 days
Little Rock Mar 23 Nov 9 230 days
Pine Bluff Mar 19 Nov 8 234 days
California      
Eureka Jan 30 Dec 15 324 days
Fresno Feb 22 Nov 25 273 days
Sacramento Feb 14 Dec 1 289 days
San Bernardino Feb 23 Dec 8 294 days
San Francisco Jan 8 Jan 5 362 days
San Jose Jan 22 Dec 25 338 days
Santa Rosa Mar 25 Nov 19 236 days
Colorado      
Denver May 3 Oct 8 157 days
Durango June 4 Sep 18 105 days
Connecticut      
Hartford Apr 25 Oct 10 167 days
New Haven Apr 15 Oct 27 195 days
Delaware      
Wilmington Apr 13 Oct 29 198 days
D.C.      
Washington Apr 10 Oct 31 203 days
Florida      
Avon Park Mar 1 Dec 6 282 days
Ft. Lauderdale Feb 1 Jan 16 350 days
Gainesville Mar 29 Nov 5 221 days
Jacksonville Feb 14 Nov 16 303 days
Orlando Jan 31 Dec 17 320 days
Tallahassee Mar 12 Nov 14 246 days
Tampa Feb 25 Dec 3 338 days
Georgia      
Athens Mar 28 Nov 8 224 days
Atlanta Mar 13 Nov 12 243 days
Savannah Mar 10 Nov 15 250 days
Idaho      
Boise May 8 Oct 9 153 days
Pocatello May 20 Sep 20 122
Illinois      
Chicago Apr 14 Nov 2 201 days
Springfield Apr 17 Oct 19 185 days
Indiana      
Indianapolis Apr 22 Oct 20 180 days
South Bend May 1 Oct 18 169 days
Iowa      
Cedar Rapids Apr 29 Oct 7 161 days
Des Moines Apr 19 Oct 17 180 days
Kansas      
Manhattan April 23 Oct 16 176 days
Topeka Apr 21 Oct 14 175 days
Wichita Apr 13 Oct 23 193 days
Kentucky      
Lexington Apr 17 Oct 25 190 days
Louisville Apr 1 Nov 7 220 days
Louisiana      
Monroe Mar 9 Nov 7 242 days
New Orleans Feb 20 Dec 5 288 days
Maine      
Portland May 10 Sep 30 143 days
Maryland      
Baltimore Mar 26 Nov 13 231 days
Massachusetts      
Amherst May 9 Sep 29 142 days
/Boston Apr 6 Nov 10 217 days
Worcester Apr 27 Oct 17 172 days
Michigan      
Detroit Apr 24 Oct 22 181 days
Lansing May 13 Sep 30 140 days
Marquette May 12 Oct 19 159 days
Minnesota      
Duluth May 21 Sep 21 122 days
Minneapolis Apr 30 Oct 13 166 days
Mississippi      
Columbus Mar 27 Oct 29 215 days
Jackson Mar 17 Nov 9 236 days
Vicksburg Mar 13 Nov 18 250 days
Missouri      
Jefferson City Apr 28 Oct 16 173 days
St. Louis Apr 3 Nov 6 217 days
Montana      
Billings May 12 Sep 23 133 days
Helena May 18 Sep 18 122 days
Nebraska      
Lincoln Mar 13 Nov 13 180 days
Nevada      
Las Vegas Mar 7 Nov 21 259 days
New Hampshire      
Concord May 23 Sep 22 121 days
New Jersey      
Newark Apr 4 Nov 10 219 days
Trenton Apr 6 Nov 7 214 days
New Mexico      
Albuquerque Apr 16 Oct 29 196 days
Los Alamos May 8 Oct 13 157 days
New York      
Albany May 7 Sep 29 144 days
New York Apr 1 Nov 11 233 days
Rochester May 3 Oct 15 164 days
Syracuse Apr 28 Oct 16 170 days
North Carolina      
Asheville Apr 10 Oct 24 195 days
Charlotte Mar 21 Nov 15 239 days
Fayetteville Apr 2 Oct 31 212 days
Raleigh Apr 11 Oct 27 198 days
North Dakota      
Bismarck May 14 Sep 20 129 days
Fargo May 13 Sep 27 137 days
Ohio      
Akron May 3 Oct 18 168 days
Cincinnati Apr 14 Oct 27 195 days
Columbus Apr 26 Oct 17 173 days
Oklahoma      
Oklahoma City Mar 28 Nov 7 224 days
Tulsa Mar 30 Nov 4 218 days
Oregon      
Portland Apr 3 Nov 7 217 days
Pennsylvania      
Pittsburgh Apr 16 Nov 3 201 days
State College Apr 27 Oct 15 170 days
Rhode Island      
Kingston May 8 Sep 30 144 days
South Carolina      
Charleston Mar 11 Nov 20 253 days
Columbia Apr 4 Nov 2 211 days
South Dakota      
Rapid City May 7 Sep 29 145 days
Tennessee      
Memphis Mar 23 Nov 7 228 days
Nashville Apr 5 Oct 29 207 days
Texas      
Dallas Mar 18 Nov 12 239 days
Houston Feb 4 Dec 10 309 days
San Antonio Mar 3 Nov 24 265 days
Utah      
Salt Lake Apr 12 Nov 1 203 days
Vermont      
Burlington May 11 Oct 1 142 days
Virginia      
Norfolk Mar 23 Nov 17 239 days
Richmond Apr 10 Oct 26 198 days
Washington      
Seattle Mar 24 Nov 11 232 days
Spokane May 4 Oct 5 153 days
West Virginia      
Parkersburg Apr 25 Oct 18 175 days
Wisconsin
Green Bay May 12 Oct 2 143 days
Milwaukee May 5 Oct 9 156 days
Wyoming      
Casper May 22 Sep 22 123 days
Cheyenne May 20 Sep 27 130 days



The chart below shows the last and first frost dates for each USDA Hardiness Zone. This information is useful both in terms of knowing when to sow seeds as well as figuring out how late in the season you can plant perennials, trees, and shrubs.

Please note that the dates on this chart are approximate. Most years, the first and last frost will fall within two weeks of the date on the chart, but some years, we get a very early frost or a late snow storm that throws the dates off. Use your discretion (and your local weather forecast!) along with this chart to plan your seed starting and planting.


First and Last Frost Dates, by Hardiness Zone

USDA Hardiness Zone First Frost Date Last Frost Date
1 July 15th June 15th
2 August 15th May 15th
3 September 15th May 15th
4 September 15th May 15th
5 October 15th April 15th
6 October 15th April 15th
7 October 15th April 15th
8 November 15th March 15th
9 December 15th February 15th
10 December 15th January 31st (sometimes earlier)
11 No frost No frost

Chart provided by: About.com Organic Gardening



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