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 @ 2:50 am -> 2026-05-20 @ 9:00 am |
| Onset: | 2026-05-20 @ 2:50 am -> 2026-05-20 @ 9:00 am |
| Severity: | Minor |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Cheyenne WY on 2026-05-20 @ 2:50 am |
| Headline: | Frost Advisory issued May 20 at 1:50AM 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 @ 2:50 am -> 2026-05-20 @ 9:00 am |
| Onset: | 2026-05-20 @ 2:50 am -> 2026-05-20 @ 9:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Cheyenne WY on 2026-05-20 @ 2:50 am |
| Headline: | Freeze Warning issued May 20 at 1:50AM 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: | Dense Fog Advisory |
| Area(s): | South Laramie Range |
| Effective: | 2026-05-20 @ 2:50 am -> 2026-05-20 @ 11:00 am |
| Onset: | 2026-05-20 @ 2:50 am -> 2026-05-20 @ 10:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Cheyenne WY on 2026-05-20 @ 2:50 am |
| Headline: | Dense Fog Advisory issued May 20 at 1:50AM MDT until May 20 at 9:00AM MDT by NWS Cheyenne WY |
| Description: |
...FREEZE WARNING REMAINS IN EFFECT UNTIL 10 AM MDT THIS MORNING... * WHAT...For the Dense Fog Advisory, visibility below one quarter of a mile in dense fog. For the Freeze Warning, sub-freezing temperatures as low as 30 degrees. * WHERE...South Laramie Range. * WHEN...For the Dense Fog Advisory, until 9 AM MDT this morning. For the Freeze Warning, until 10 AM MDT this morning. * IMPACTS...Low visibility could make driving conditions hazardous. |
| 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 |
| Effective: | 2026-05-20 @ 2:50 am -> 2026-05-20 @ 11:00 am |
| Onset: | 2026-05-20 @ 2:50 am -> 2026-05-20 @ 11:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Cheyenne WY on 2026-05-20 @ 2:50 am |
| Headline: | Freeze Warning issued May 20 at 1:50AM MDT until May 20 at 10:00AM MDT by NWS Cheyenne WY |
| Description: |
* WHAT...Sub-freezing temperatures as low as 13. * 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): | South Laramie Range |
| Effective: | 2026-05-20 @ 2:50 am -> 2026-05-20 @ 11:00 am |
| Onset: | 2026-05-20 @ 2:50 am -> 2026-05-20 @ 11:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Cheyenne WY on 2026-05-20 @ 2:50 am |
| Headline: | Freeze Warning issued May 20 at 1:50AM MDT until May 20 at 10:00AM MDT by NWS Cheyenne WY |
| Description: |
...FREEZE WARNING REMAINS IN EFFECT UNTIL 10 AM MDT THIS MORNING... * WHAT...For the Dense Fog Advisory, visibility below one quarter of a mile in dense fog. For the Freeze Warning, sub-freezing temperatures as low as 30 degrees. * WHERE...South Laramie Range. * WHEN...For the Dense Fog Advisory, until 9 AM MDT this morning. For the Freeze Warning, until 10 AM MDT this morning. * IMPACTS...Low visibility could make driving conditions hazardous. |
| 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. |