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Frost Dates for US & Canada

General Frost Date Information

Dates given are normal averages for a light freeze (32°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°F to 32°F -- tender plants killed, with little destructive effect on other vegetation. Moderate freeze: 25°F to 28°F -- widely destructive effect on most vegetation, with heavy damage to fruit blossoms and tender and semihardy plants. Severe freeze: 24°F and colder -- damage to most plants.

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Frost Dates by U.S. City/State

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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	ov. 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
*Frosts do not occur every year.

Frost Dates by Canadian City/Province

City	Province	Growing Season(Length in Days)	Last Frost Spring	First Frost Fall
Athabasca	AB	88	Jun. 1	Aug. 29
Calgary	AB	114	May 23	Sept. 15
Edmonton	AB	138	May 7	Sept. 23
Grande Prairie	AB	117	May 18	Sept. 13
Lethbridge	AB	123	May 17	Sept. 18
Medicine Hat	AB	128	May 16	Sept. 22
Peace River	AB	99	May 26	Sept. 3
Red Deer	AB	106	May 25	Sept. 9
Abbotsford	BC	177	Apr. 24	Oct. 18
Chilliwack	BC	216	Apr. 6	Nov. 9
Dawson Creek	BC	84	Jun. 5	Aug. 29
Kamloops	BC	156	Jun. 1	Oct. 5
Kelowna	BC	123	May 19	Sept. 20
Nanaimo	BC	171	Apr. 28	Oct. 17
Nelson	BC	159	May 4	Oct. 13
Port Alberni	BC	159	May 8	Oct. 15
Prince George	BC	91	Jun. 4	Sept. 3
Prince Rupert	BC	156	May 9	Oct. 13
Vancouver	BC	221	Mar. 28	Nov. 5
Victoria	BC	200	Apr. 19	Nov. 5
Brandon	MB	105	May 27	Sept. 10
Lynn Lake	MB	89	Jun. 8	Sept. 6
The Pas	MB	112	May 27	Sept. 17
Thompson	MB	61	Jun. 15	Aug. 16
Winnipeg	MB	119	May 25	Sept. 22
Bathurst	NB	129	May 19	Sept. 26
Edmundsto	NB	112	May 28	Sept. 18
Fredericton	NB	124	May 20	Sept. 22
Moncton	NB	125	May 24	Sept. 27
Saint John	NB	139	May 18	Oct. 4
Corner Brook	NF	142	May 22	Oct. 12
Gander	NF	123	Jun. 3	Oct. 5
Grand Falls	NF	115	Jun. 2	Sept. 26
St. John's	NF	131	Jun. 2	Oct. 12
Halifax	NS	166	May 6	Oct. 20
Kentville	NS	141	May 16	Oct. 5
Sydney	NS	141	May 24	Oct. 13
Truro	NS	113	May 30	Sept. 21
Yarmouth	NS	169	May 1	Oct. 18
Aklavik	NT	76	Jun. 13	Aug. 31
Fort Simpson	NT	81	Jun. 3	Aug. 24
Yellowknife	NT	110	May 27	Sept. 15
Barrie	ON	112	May 26	Sept. 16
Hamilton	ON	168	Apr. 29	Oct. 15
Kapuskasing	ON	87	Jun. 12	Sept. 8
Kingston	ON	160	May 2	Oct. 10
Kitchener	ON	139	May 11	Sept. 29
London	ON	151	May 9	Oct. 8
Ottawa	ON	151	May 6	Oct. 5
Owen Sound	ON	155	May 12	Oct. 15
Peterborough	ON	124	May 18	Sept. 20
Sudbury	ON	130	May 17	Sept. 25
Thunder Bay	ON	105	Jun. 1	Sept. 15
Timmins	ON	89	Jun. 8	Sept. 6
Toronto	ON	149	May 9	Oct. 6
Windsor	ON	179	Apr. 25	Oct. 22
Charlottetown	PE	150	May 17	Oct. 14
Summerside	PE	162	May 9	Oct. 19
Tignish	PE	138	May 23	Oct. 9
Baie Comeau	QC	109	May 28	Sept. 15
Chicoutimi	QC	133	May 17	Sept. 30
Montreal	QC	156	May 3	Oct. 7
Quebec	QC	139	May 13	Sept. 29
Rimouski	QC	139	May 13	Sept. 30
Sherbrooke	QC	100	Jun. 1	Sept. 10
Tadoussac	QC	141	May 13	Oct. 2
Thetford Mines	QC	106	May 28	Sept. 14
Trois-Rivieres	QC	124	May 19	Sept. 23
Moose Jaw	SK	120	May 20	Sept. 18
North Battleford	SK	120	May 19	Sept. 17
Prince Albert	SK	93	Jun. 2	Sept. 4
Regina	SK	111	May 21 S	ept. 10
Saskatoon	SK	116	May 21	Sept. 15
Weyburn	SK	112	May 22	Sept. 12
Yorkton	SK	110	May 23	Sept. 11
Dawson	YT	62	Jun. 13	Aug. 17
Watson Lake	YT	91	Jun. 2	Sept. 4