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Frost Chart for United States
Courtesy of National Climatic Center Also see our Frost Chart for Canada.
Dates given are normal averages for a light freeze (32 degrees F); local weather and topography may cause considerable variations. The possibility of frost occurring after the spring dates and before the fall dates is 50 percent. The classification of freeze temperatures is usually based on their effect on plants, with the following commonly accepted categories: Light freeze: 29 degrees F to 32 degrees F -- tender plants killed, with little destructive effect on other vegetation. Moderate freeze: 25 degrees F to 28 degrees F -- widely destructive effect on most vegetation, with heavy damage to fruit blossoms and tender and semi-hardy plants. Severe freeze: 24 degrees F and colder -- damage to most plants.
City
State
Growing Season (Length in Days)
Last Frost Spring
First Frost Fall
Mobile
AL
272
Feb. 27
Nov. 26
Juneau
AK
133
May 16
Sept. 26
Phoenix
AZ
308
Feb. 5
Dec. 15
Tucson
AZ
273
Feb. 28
Nov. 29
Pine Bluff
AR
234
Mar. 19
Nov. 8
Eureka
CA
324
Jan. 30
Dec. 15
Sacramento
CA
289
Feb. 14
Dec. 1
San Francisco
CA
*
*
*
Denver
CO
157
May 3
Oct. 8
Hartford
CT
167
Apr. 25
Oct. 10
Wilmington
DE
198
Apr. 13
Oct. 29
Miami
FL
*
*
*
Tampa
FL
338
Jan. 28
Jan. 3
Athens
GA
224
Mar. 28
Nov. 8
Savannah
GA
250
Mar. 10
Nov. 15
Boise
ID
153
May 8
Oct. 9
Chicago
IL
187
Apr. 22
Oct. 26
Springfield
IL
185
Apr. 17
Oct. 19
Indianapolis
IN
180
Apr. 22
Oct. 20
South Bend
IN
169
May 1
Oct. 18
Atlantic
IA
141
May 9
Sept. 28
Cedar Rapids
IA
161
Apr. 29
Oct. 7
Topeka
KS
175
Apr. 21
Oct. 14
Lexington
KY
190
Apr. 17
Oct. 25
Monroe
LA
242
Mar. 9
Nov. 7
New Orleans
LA
288
Feb. 20
Dec. 5
Portland
ME
143
May 10
Sept. 30
Baltimore
MD
231
Mar. 26
Nov. 13
Worcester
MA
172
Apr. 27
Oct. 17
Lansing
MI
140
May 13
Sept. 30
Marquette
MI
159
May 12
Oct. 19
Duluth
MN
122
May 21
Sept. 21
Willmar
MN
152
May 4
Oct. 4
Columbus
MS
215
Mar. 27
Oct. 29
Vicksburg
MS
250
Mar. 13
Nov. 18
Jefferson City
MO
173
Apr. 26
Oct. 16
Fort Peck
MT
146
May 5
Sept. 28
Helena
MT
122
May 18
Sept. 18
Blair
NE
165
Apr. 27
Oct. 10
North Platte
NE
136
May 11
Sept. 24
Las Vegas
NV
259
Mar. 7
Nov. 21
Concord
NH
121
May 23
Sept. 22
Newark
NJ
219
Apr. 4
Nov. 10
Carlsbad
NM
223
Mar. 29
Nov. 7
Los Alamos
NM
157
May 8
Oct. 13
Albany
NY
144
May 7
Sept. 29
Syracuse
NY
170
Apr. 28
Oct. 16
Fayetteville
NC
212
Apr. 2
Oct. 31
Bismarck
ND
129
May 14
Sept. 20
Akron
OH
168
May 3
Oct. 18
Cincinnati
OH
195
Apr. 14
Oct. 27
Lawton
OK
217
Apr. 1
Nov. 5
Tulsa
OK
218
Mar. 30
Nov. 4
Pendleton
OR
188
Apr. 15
Oct. 21
Portland
OR
217
Apr. 3
Nov. 7
Carlisle
PA
182
Apr. 20
Oct. 20
Williamsport
PA
168
Apr. 29
Oct. 15
Kingston
RI
144
May 8
Sept. 30
Charleston
SC
253
Mar. 11
Nov. 20
Columbia
SC
211
Apr. 4
Nov. 2
Rapid City
SD
145
May 7
Sept. 29
Memphis
TN
228
Mar. 23
Nov. 7
Nashville
TN
207
Apr. 5
Oct. 29
Amarillo
TX
197
Apr. 14
Oct. 29
Denton
TX
231
Mar. 25
Nov. 12
San Antonio
TX
265
Mar. 3
Nov. 24
Cedar City
UT
134
May 20
Oct. 2
Spanish Fork
UT
156
May 8
Oct. 12
Burlington
VT
142
May 11
Oct. 1
Norfolk
VA
239
Mar. 23
Nov. 17
Richmond
VA
198
Apr. 10
Oct. 26
Seattle
WA
232
Mar. 24
Nov. 11
Spokane
WA
153
May 4
Oct. 5
Parkersburg
WV
175
Apr. 25
Oct. 18
Green Bay
WI
143
May 12
Oct. 2
Janesville
WI
164
Apr. 28
Oct. 10
Casper
WY
123
May 22
Sept. 22
Early and late frosts and freezes don't need to be a "big deal" or spell the end of your gardening season if you're prepared. Turn to these trusted merchants for proven "season extenders".
