Frost Data East Idaho 1988

Frost Data East Idaho 1988

Freeze/Frost Occurrence for East Idaho

From: Climatography of the United States No. 20: climatic Summaries for Selected Sites, 1951-1988 National Climatic Data Center- National Oceanic and Atmospheric Administration, January 1988

Last Spring Frost First Fall Frost
Frost Free Period

Average5 10%6

City Average1 Safe Date2 Safe Date3 Average4
Aberdeen
Jun 2

May 16

Jun 12

Jun 15

May 16

May 28

Jun 18

May 30

May 24

Jun 8

Jun 14

Jun 13

May 25

Jul 1

Jun 8

May 22

Jun 16

May 25

Jun 2

May 20

Jun 4

Jun 2

Jun 23

Jun 7

Jul 4

Jul 7

Jun 5

Jun 24

Jul 7

Jun 21

Jun 12

Jun 28

Jul 1

Jul 7

Jun 14

Jul 18

Jun 30

Jun 13

Jul 5

Jun 13

Jun 24

Jun 12

Jun 29

Jun 26

Aug 31 Sep 12 101 82
American Falls Sep 9 Sep 25 131 98
Arco Aug 24 Sep 5 84 58
Ashton Aug 19 Sep 4 81 53
Burley Sep 9 Sep 21 127 102
Challis Sep 4 Sep 17 111 81
Driggs Aug 18 Sep 3 76 51
Dubois Sep 10 Sep 23 115 89
Fort Hall Aug 30 Sep 17 115 87
Grace Aug 25 Sep 9 92 69
Hailey Aug 20 Sep 10 87 56
Hamer Aug 21 Sep 5 83 54
Idaho Falls Sep 4 Sep 17 114 88
Island Park Aug 8 Aug 25 54 29
Mackay Aug 29 Sep 10 93 65
Malad Sep 7 Sep 24 124 96
Montpelier Aug 17 Sep 1 77 51
Oakley Sep 13 Sep 28 126 102
Palisades Aug 23 Sep 13 102 70
Pocatello Sep 6 Sep 20 122 97
St. Anthony Aug 21 Sep 6 93 61
Salmon Aug 30 Sep 15 104 73

1 The average date of the last spring frost. It will fall later than this 50% of the time.

2 The date when it is considered safe to plant. There is only a 10% chance of frost after this date.

3 There is only a 10% chance that the first fall frost will occur before this date.

4 The average date of the first fall frost. It will fall earlier than this 50% of the time.

5 The average number of consecutive frost free days. Sometimes called the “growing season”.

6 There is a 10% chance that the growing season will be this short or shorter.

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