Tropical Storm Imelda Forms; Another Round of Heavy Rain and Potential Flooding in the Southwest

Tropical Storm Imelda has formed near the Bahamas Sunday afternoon, and continues to bring heavy rainfall. The risk of significant wind impacts from Imelda along the Southeast coast are decreasing. Another round of showers and storms with a heavy rain and flash flood threat will continue in the Southwest through Monday morning. Read More >

Southwest Idaho And Southeast Oregon Freeze Data

Table lists the average freeze date from 1991 through 2020. 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 13	April 30	April 8	March 10
Nampa	May 20	May 2	April 11	March 16
Emmett	May 16	May 2	April 13	March 20
Payette	May 7	April 27	April 8	March 19
Parma	May 19	May 1	April 17	April 1
Nyssa	May 16	May 1	April 3	March 16
Vale, Oregon	June 2	May 13	April 18	April 9
Grand View	May 16	May 5	April 21	March 30
Glenns Ferry	May 29	May 10	April 28	March 31
Twin Falls	May 28	May 6	April 22	March 30
Jerome	May 27	May 8	April 21	April 2

	36 F	32 F	28 F	24 F
Boise	Oct. 4	Oct. 16	Oct. 29	Nov. 8
Nampa	Oct. 1	Oct. 16	Oct. 26	Nov. 5
Emmett	Oct. 3	Oct. 15	Oct. 26	Nov. 6
Payette	Oct. 5	Oct. 13	Oct. 26	Nov. 4
Parma	Sept. 29	Oct. 4	Oct. 16	Nov. 1
Nyssa	Sept. 29	Oct. 15	Oct. 27	Nov. 6
Vale, Oregon	Sept. 17	Sept. 24	Oct. 10	Oct. 24
Grand View	Sept. 13	Oct. 2	Oct. 14	Oct. 26
Glenns Ferry	Sept. 10	Sept. 30	Oct. 11	Oct. 26
Twin Falls	Sept. 25	Oct. 5	Oct. 16	Oct. 27
Jerome	Sept. 24	Oct. 4	Oct. 19	Oct.29

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