Cheyenne, Wyoming

Regional Weather Alerts


     

Alert: Frost Advisory
Area(s): North Sioux; Niobrara County; Central Laramie Range and Southwest Platte County; East Platte County; South Laramie Range Foothills
Effective: 2026-05-20 @ 1:56 am -> 2026-05-20 @ 9:00 am
Onset: 2026-05-20 @ 1:56 am -> 2026-05-20 @ 9:00 am
Severity: Minor
Certainty: Likely
Urgency: Expected
Issued By: NWS Cheyenne WY on 2026-05-20 @ 1:56 am
Headline: Frost Advisory issued May 20 at 12:56AM MDT until May 20 at 8:00AM MDT by NWS Cheyenne WY
Description: * WHAT...Temperatures between 29 and 34 will result in frost
formation.

* WHERE...In Nebraska, Northern Sioux County. In Wyoming, Niobrara
County, Central Laramie Range and Southwest Platte County, East
Platte County, and South Laramie Range Foothills.

* WHEN...Until 8 AM MDT this morning.

* IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive
outdoor plants may be killed if left uncovered.

Alert: Freeze Warning
Area(s): Converse County Lower Elevations; Laramie Valley
Effective: 2026-05-20 @ 1:56 am -> 2026-05-20 @ 9:00 am
Onset: 2026-05-20 @ 1:56 am -> 2026-05-20 @ 9:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Cheyenne WY on 2026-05-20 @ 1:56 am
Headline: Freeze Warning issued May 20 at 12:56AM MDT until May 20 at 8:00AM MDT by NWS Cheyenne WY
Description: * WHAT...Sub-freezing temperatures between 25 and 32 degrees
expected.

* WHERE...Converse County Lower Elevations and Laramie Valley.

* WHEN...Until 8 AM MDT this morning.

* IMPACTS...Frost and freeze conditions could kill crops, other
sensitive vegetation and possibly damage unprotected outdoor
plumbing.

Alert: Freeze Warning
Area(s): Ferris/Seminoe/Shirley Mountains; Shirley Basin; Central Carbon County; North Snowy Range Foothills; Southwest Carbon County; Upper North Platte River Basin; South Laramie Range
Effective: 2026-05-20 @ 1:56 am -> 2026-05-20 @ 11:00 am
Onset: 2026-05-20 @ 1:56 am -> 2026-05-20 @ 11:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Cheyenne WY on 2026-05-20 @ 1:56 am
Headline: Freeze Warning issued May 20 at 12:56AM MDT until May 20 at 10:00AM MDT by NWS Cheyenne WY
Description: * WHAT...Sub-freezing temperatures as low as 16 degrees.

* WHERE...Central Carbon County, Ferris/Seminoe/Shirley Mountains,
North Snowy Range Foothills, Shirley Basin, Southwest Carbon
County, Upper North Platte River Basin, and South Laramie Range.

* WHEN...Until 10 AM MDT this morning.

* IMPACTS...Frost and freeze conditions could kill crops, other
sensitive vegetation and possibly damage unprotected outdoor
plumbing.

Alert: Freeze Warning
Area(s): Southern Campbell; Western Crook; Weston County Plains; Newcastle; Northeastern Crook
Effective: 2026-05-19 @ 11:12 pm -> 2026-05-20 @ 9:00 am
Onset: 2026-05-20 @ 3:00 am -> 2026-05-20 @ 9:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Rapid City SD on 2026-05-19 @ 11:12 pm
Headline: Freeze Warning issued May 19 at 10:12PM MDT until May 20 at 8:00AM MDT by NWS Rapid City SD
Description: * WHAT...Sub-freezing temperatures as low as 29 expected.

* WHERE...Newcastle, Northeastern Crook, Southern Campbell, Western
Crook, and Weston County Plains.

* WHEN...From 2 AM to 8 AM MDT Wednesday.

* IMPACTS...Frost and freeze conditions could kill crops, other
sensitive vegetation and possibly damage unprotected outdoor
plumbing.

Alert: Freeze Warning
Area(s): Southeast Johnson County; Upper Wind River Basin; Wind River Basin; Lander Foothills; Green Mountains and Rattlesnake Range; Natrona County Lower Elevations
Effective: 2026-05-19 @ 10:35 am -> 2026-05-20 @ 9:00 am
Onset: 2026-05-19 @ 10:00 pm -> 2026-05-20 @ 9:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Riverton WY on 2026-05-19 @ 10:35 am
Headline: Freeze Warning issued May 19 at 9:35AM MDT until May 20 at 8:00AM MDT by NWS Riverton WY
Description: * WHAT...Sub-freezing temperatures between 25 and 30 degrees
expected. The coldest temperatures occur where recent snowfall has
occurred, where lows may reach as cold as 20 degrees.

* WHERE...Green Mountains and Rattlesnake Range, Lander Foothills,
Natrona County Lower Elevations, Upper Wind River Basin, Wind
River Basin, and Southeast Johnson County.

* WHEN...From 9 PM this evening to 8 AM MDT Wednesday.

* IMPACTS...Frost and freeze conditions could kill crops, other
sensitive vegetation and possibly damage unprotected outdoor
plumbing.

Alert: Freeze Warning
Area(s): Southwest Bighorn Basin; Southeast Bighorn Basin
Effective: 2026-05-19 @ 10:35 am -> 2026-05-20 @ 9:00 am
Onset: 2026-05-19 @ 10:00 pm -> 2026-05-20 @ 9:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Riverton WY on 2026-05-19 @ 10:35 am
Headline: Freeze Warning issued May 19 at 9:35AM MDT until May 20 at 8:00AM MDT by NWS Riverton WY
Description: * WHAT...Sub-freezing temperatures as low as 28 expected.

* WHERE...Southwest Bighorn Basin and Southeast Bighorn Basin.

* WHEN...From 9 PM this evening to 8 AM MDT Wednesday.

* IMPACTS...Frost and freeze conditions could kill crops, other
sensitive vegetation and possibly damage unprotected outdoor
plumbing.