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 semihardy 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

 

Succession Intensive Square Foot Gardening
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Finding your Container, Fertilizer, Make Soils and Watering
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