■ Dates given are normal averages for a light freeze; 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. Light freeze: 29° to 32°F—tender plants killed. Moderate freeze: 25° to 28°F—widely destructive effect on most vegetation. Severe freeze: 24°F and colder—heavy damage to most plants.
–courtesy of National Climatic Data Center
Growing Season
State City (days)
AK Juneau 133
AL Mobile 273
AR Pine Bluff 234
AZ Phoenix 309
AZ Tucson 274
CA Eureka 325
CA Sacramento 290
CA San Francisco
CO Denver 157
CT Hartford 167
DE Wilmington 198
FL Miami
FL Tampa 339
GA Athens 224
GA Savannah 250
IA Atlantic 141
IA Cedar Rapids 161
ID Boise 153
IL Chicago 187
IL Springfield 185
IN Indianapolis 180
IN SouthBend 169
KS Topeka 175
KY Lexington 190
LA Monroe 242
LA New Orleans 289
MA Worcester 172
MD Baltimore 231
ME Portland 143
MI Lansing 140
MI Marquette 159
MN Duluth 122
MN Willmar 152
MO Jefferson City 173
MS Columbus 215
MS Vicksburg 250
M T Fort Peck 146
MT Helena 122
NC Fayetteville 212
Last First Spring Fall Frost Frost
May 16 Sept. 26
Feb. 27 Nov. 26
Mar. 19 Nov. 8
Feb. 5 Dec. 15
Feb. 28 Nov. 29
Jan. 30 Dec. 15
Feb. 14 Dec. 1
**
May 3 Oct. 8
Apr. 25 Oct. 10
Apr. 13 Oct. 29
**
Jan. 28 Jan. 3
Mar. 28 Nov. 8
Mar. 10 Nov. 15
May 9 Sept. 28
Apr. 29 Oct. 7
May 8 Oct. 9
Apr. 22 Oct. 26
Apr. 17 Oct. 19
Apr. 22 Oct. 20
May 1 Oct. 18
Apr. 21 Oct. 14
Apr. 17 Oct. 25
Mar. 9 Nov. 7
Feb. 20 Dec. 5
Apr. 27 Oct. 17
Mar. 26 Nov. 13
May 10 Sept. 30
May 13 Sept. 30
May 12 Oct. 19
May 21 Sept. 21
May 4 Oct. 4
Apr. 26 Oct. 16
Mar. 27 Oct. 29
Mar. 13 Nov. 18
May 5 Sept. 28
May 18 Sept. 18
Apr. 2 Oct. 31
Growing Season
State City (days)
ND Bismarck 129
NE Blair 165
NE North Platte 136
NH Concord 121
NJ Newark 219
NM Carlsbad 223
NM Los Alamos 157
NV Las Vegas 259
NY Albany 144
NY Syracuse 170
OH Akron 168
OH Cincinnati 195
OK Lawton 217
OK Tulsa 218
OR Pendleton 188
OR Portland 217
PA Carlisle 182
PA Williamsport 168
RI Kingston 144
SC Charleston 253
SC Columbia 211
SD Rapid City 145
TN Memphis 228
TN Nashville 207
TX Amarillo 197
TX Denton 231
TX SanAntonio 265
UT Cedar City 134
U T Spanish Fork 156
VA Norfolk 239
VA Richmond 198
VT Burlington 142
WA Seattle 232
WA Spokane 153
WI Green Bay 143
WI Janesville 164
WV Parkersburg 175
WY Casper 123
*Frosts do not occur every year.
Last First Spring Fall Frost Frost
May 14 Sept. 20
Apr. 27 Oct. 10
May 11 Sept. 24
May 23 Sept. 22
Apr. 4 Nov. 10
Mar. 29 Nov. 7
May 8 Oct. 13
Mar. 7 Nov. 21
May 7 Sept. 29
Apr. 28 Oct. 16
May 3 Oct. 18
Apr. 14 Oct. 27
Apr. 1 Nov. 5
Mar. 30 Nov. 4
Apr. 15 Oct. 21
Apr. 3 Nov. 7
Apr. 20 Oct. 20
Apr. 29 Oct. 15
May 8 Sept. 30
Mar. 11 Nov. 20
Apr. 4 Nov. 2
May 7 Sept. 29
Mar. 23 Nov. 7
Apr. 5 Oct. 29
Apr. 14 Oct. 29
Mar. 25 Nov. 12
Mar. 3 Nov. 24
May 20 Oct. 2
May 8 Oct. 12
Mar. 23 Nov. 17
Apr. 10 Oct. 26
May 11 Oct. 1
Mar. 24 Nov. 11
May 4 Oct. 5
May 12 Oct. 2
Apr. 28 Oct. 10
Apr. 25 Oct. 18
References:
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