Frost Advisory
URGENT - WEATHER MESSAGE
National Weather Service Pocatello ID
835 PM MDT Mon May 18 2026
IDZ051-055-191200-
/O.CON.KPIH.FR.Y.0006.260519T0900Z-260519T1500Z/
Shoshone/Lava Beds-Eastern Magic Valley-
Including the cities of Oakley, Carey, Burley, Rupert, Shoshone,
Heyburn, and Richfield
835 PM MDT Mon May 18 2026
...FROST ADVISORY REMAINS IN EFFECT FROM 3 AM TO 9 AM MDT TUESDAY...
* WHAT...Temperatures ranging from 33 to 36 will result in frost
formation.
* WHERE...Eastern Magic Valley and Shoshone/Lava Beds.
* WHEN...From 3 AM to 9 AM MDT Tuesday.
* IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive
outdoor plants may be killed if left uncovered.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Take steps now to protect tender plants from the cold.
&&
$$
Visit weather.gov/pocatello for more information.
13
URGENT - WEATHER MESSAGE
National Weather Service Boise ID
144 PM MDT Mon May 18 2026
IDZ016-191400-
/O.NEW.KBOI.FR.Y.0001.260519T1000Z-260519T1400Z/
Western Magic Valley-
Including the cities of Twin Falls
144 PM MDT Mon May 18 2026
...FROST ADVISORY IN EFFECT FROM 4 AM TO 8 AM MDT TUESDAY...
* WHAT...Temperatures as low as 33 will result in frost formation.
* WHERE...Western Magic Valley.
* WHEN...From 4 AM to 8 AM MDT Tuesday.
* IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive
outdoor plants may be killed if left uncovered.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Take steps now to protect tender plants from the cold.
&&
$$
NF
URGENT - WEATHER MESSAGE
National Weather Service Missoula MT
1200 PM MDT Mon May 18 2026
IDZ010-191500-
/O.NEW.KMSO.FR.Y.0004.260519T0600Z-260519T1500Z/
Eastern Lemhi County-
1200 PM MDT Mon May 18 2026
...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM MDT
TUESDAY...
* WHAT...Temperatures ranging from 24 to 32 degrees will result in
frost formation.
* WHERE...Eastern Lemhi County.
* WHEN...From midnight tonight to 9 AM MDT Tuesday.
* IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive
outdoor plants may be killed if left uncovered.
* ADDITIONAL DETAILS...Temperature ranges: 27 to 32 degrees Salmon
area and south along US-93, 26 to 31 in Gibbonsville, and 22 to 28
in Leadore
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Take steps now to protect tender plants from the cold.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service Missoula MT
1200 PM MDT Mon May 18 2026
IDZ005-006-191500-
/O.NEW.KMSO.FR.Y.0004.260519T0600Z-260519T1500Z/
Northern Clearwater Mountains-Southern Clearwater Mountains-
1100 AM PDT Mon May 18 2026
...FROST ADVISORY IN EFFECT FROM 11 PM THIS EVENING TO 8 AM PDT
TUESDAY ABOVE 3000 FEET...
* WHAT...Temperatures as low as 28 will result in frost formation
above 3000 feet. Colder temperatures are expected in the higher
valleys.
* WHERE...Southern Clearwater Mountains and Northern Clearwater
Mountains.
* WHEN...From 11 PM this evening to 8 AM PDT Tuesday.
* IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive
outdoor plants may be killed if left uncovered.
* ADDITIONAL DETAILS...Temperature ranges: 30 to 33 Pierce to
Grangemont area, and 33 to 36 in Elk River. In Idaho County, 28 to
33 in Powell, 26 to 29 Elk City, and 19 to 25 in both Dixie and Elk
River where a hard freeze is expected.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Take steps now to protect tender plants from the cold.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service Missoula MT
1200 PM MDT Mon May 18 2026
MTZ006-191500-
/O.NEW.KMSO.FR.Y.0004.260519T0600Z-260519T1500Z/
Bitterroot/Sapphire Mountains-
1200 PM MDT Mon May 18 2026
...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM MDT
TUESDAY...
* WHAT...Temperature ranges between 25 and 32 will result in frost
formation.
* WHERE...Bitterroot/Sapphire Mountains.
* WHEN...From midnight tonight to 9 AM MDT Tuesday.
* IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive
outdoor plants may be killed if left uncovered.
* ADDITIONAL DETAILS...Temperature Ranges: 30 to 32 along US-12 west
of Lolo, 26 to 29 degrees in the Rock Creek area, 26 to 28 Sula,
and 25 to 28 in the Painted Rocks area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Take steps now to protect tender plants from the cold.
&&
$$
