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Do you have information on average last spring freeze dates in Utah?

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A

With spring approaching, it is time once again to think about planting and gardening. Knowing the average last frost date gives gardeners the opportunity to make specific plans for planting both hardy and tender plants in the garden.

Consider these average last spring and first fall freeze dates.

Location

Avg. last

spring freeze

Avg. first fall freeze

Avg. freeze free days

Beaver

June 4

Sept 16

104

Blanding

May14

Oct 11

149

Castle Dale

May 22

Sept 23

124

Cedar City

May 19

Oct 2

135

Coalville

June 15

Sept 2

78

Corinne

May 13

Sept 29

139

Delta

May 16

Sept 28

135

Farmington

May 5

Oct 10

158

Heber

June 8

Sept 7

90

Kanab

May 4

Oct 23

171

Logan

May 25

Sept 25

158

Manti

May 22

Sept 27

127

Moab

April 18

Oct 16

181

Nephi

May 15

Oct 1

138

Ogden

May 5

Oct 10

157

Panguitch

June 20

Sept 2

74

Pleasant Grove

May 11

Oct 9

151

Richfield

May 26

Sept 19

116

Roosevelt

May 15

Sept 27

134

St. George

March 29

Nov 1

216

Salt Lake City

April 26

Oct 16

172

Tooele

May 3

Oct 15

164

Vernal

May 27

Sept 20

116

Cold hardy vegetables can be planted four to six weeks before the last frost date. Some of these include broccoli, cabbage, lettuce, onions, peas and spinach. These crops thrive in cool weather and should not be planted late in the spring. Pea seeds, for example, can actually germinate when soil temperatures are about 40 F while tomato seeds germinate best when soil temperatures are above 65 F. Beets, carrots, chard, onion sets and radishes are hardy plants that can be planted two to four weeks before the last frost date.

Plants that are not cold hardy should be planted around the frost-free date. These include beans, squash, corn and tomatoes. Peppers, eggplant, cucumbers and melons require hot weather to grow well and should be planted about a week after the last expected frost. These plants may be injured if planted too early and consequently may not grow or flower well throughout the rest of the season. To get a jump on the season, several of these warm season vegetables may be started by seed inside, and then planted outside when temperatures warm.

If planted indoors, tomato and pepper seeds should be planted six to eight weeks before the last frost. The seedlings should have a bright light source such as a south window or a fluorescent light structure placed several inches above. Squash, cucumbers and melons should be seeded about two to three weeks before transplanting to the garden.

Posted on 22 Mar 2004

Loralie Cox
Horticulture Agent, Cache County

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