Southwest Idaho And Southeast Oregon Freeze Data

Southwest Idaho And Southeast Oregon Freeze Data

Table lists the average freeze date from 1981 through 2010. For the spring, the average last freeze date is given. For the fall, the average first freeze date is given.

Freeze date probabilities for each city is available here.

Here is a Frost and Freeze Summary for the Boise Airport 1940-Present.

A hard freeze is when temperatures reach or fall below 28 F.
A freeze is when temperatures reach or fall below 32 F.

SPRING

FALL

	36 F	32 F	28 F	24 F
Boise	May 20	May 8	April 19	March 19
Nampa	May 22	May 3	April 12	March 20
Emmett	May 19	May 5	April 13	March 13
Payette	May 13	May 3	April 13	March 30
Parma	May 19	May 2	April 14	March 26
Nyssa	May 14	April 22	April 5	March 16
Vale, Oregon	June 1	May 13	April 25	April 9
Grand View	May 16	May 3	April 18	March 31
Glenns Ferry	June 2	May 13	May 3	April 19
Twin Falls	June 3	May 11	April 30	April 10
Jerome	May 27	May 12	April 23	April 2

	36 F	32 F	28 F	24 F
Boise	Sept. 25	Oct. 10	Oct. 23	Nov. 6
Nampa	Sept. 24	Oct. 12	Oct. 22	Nov. 5
Emmett	Sept. 30	Oct. 11	Oct. 22	Nov. 4
Payette	Sept. 28	Oct. 10	Oct. 20	Nov. 1
Parma	Sept. 21	Oct. 1	Oct. 14	Oct. 29
Nyssa	Oct. 1	Oct. 11	Oct. 25	Nov. 8
Vale, Oregon	Sept. 16	Sept. 26	Oct. 8	Oct. 21
Grand View	Sept. 19	Oct. 4	Oct. 14	Oct. 27
Glenns Ferry	Sept. 10	Sept. 22	Oct. 8	Oct. 22
Twin Falls	Sept. 13	Sept. 24	Oct. 10	Oct. 26
Jerome	Sept. 21	Oct. 4	Oct. 17	Oct.29