Yellowstone National Park, Wyoming
Regional Weather Alerts
| Alert: | Frost Advisory |
| Area(s): | Missoula/Bitterroot Valleys |
| Effective: | 2026-05-18 @ 1:00 pm -> 2026-05-19 @ 10:00 am |
| Onset: | 2026-05-19 @ 1:00 am -> 2026-05-19 @ 10:00 am |
| Severity: | Minor |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Missoula MT on 2026-05-18 @ 1:00 pm |
| Headline: | Frost Advisory issued May 18 at 12:00PM MDT until May 19 at 9:00AM MDT by NWS Missoula MT |
| Description: |
* WHAT...Temperature ranges between 27 and 32 will result in frost formation. * WHERE...Low-lying areas of the Missoula and Bitterroot Valleys. * 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. |
| Alert: | Frost Advisory |
| Area(s): | Flathead/Mission Valleys |
| Effective: | 2026-05-18 @ 1:00 pm -> 2026-05-19 @ 10:00 am |
| Onset: | 2026-05-19 @ 1:00 am -> 2026-05-19 @ 10:00 am |
| Severity: | Minor |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Missoula MT on 2026-05-18 @ 1:00 pm |
| Headline: | Frost Advisory issued May 18 at 12:00PM MDT until May 19 at 9:00AM MDT by NWS Missoula MT |
| Description: |
* WHAT...Temperature ranges between 30 and 32 will result in frost formation. * WHERE...Flathead/Mission Valleys. * 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: 32 to 37 degrees in the Flathead Valley, and 30 to 35 in the Mission Valley. |
| Alert: | Frost Advisory |
| Area(s): | Lower Clark Fork Region |
| Effective: | 2026-05-18 @ 1:00 pm -> 2026-05-19 @ 10:00 am |
| Onset: | 2026-05-19 @ 1:00 am -> 2026-05-19 @ 10:00 am |
| Severity: | Minor |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Missoula MT on 2026-05-18 @ 1:00 pm |
| Headline: | Frost Advisory issued May 18 at 12:00PM MDT until May 19 at 9:00AM MDT by NWS Missoula MT |
| Description: |
* WHAT...Temperatures ranging between 27 and 34 will result in frost formation. * WHERE...Lower Clark Fork Region, but not along Highway 200 west of Trout Creek. * 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: 31 to 36 degrees Trout Creek to Plains and including Evaro, 31 to 35 Alberton, 33 to 35 Superior, 30 to 32 St. Regis, and 27 to 29 DeBorgia to Haugan. |
| Alert: | Frost Advisory |
| Area(s): | Bitterroot/Sapphire Mountains |
| Effective: | 2026-05-18 @ 1:00 pm -> 2026-05-19 @ 10:00 am |
| Onset: | 2026-05-19 @ 1:00 am -> 2026-05-19 @ 10:00 am |
| Severity: | Minor |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Missoula MT on 2026-05-18 @ 1:00 pm |
| Headline: | Frost Advisory issued May 18 at 12:00PM MDT until May 19 at 9:00AM MDT by NWS Missoula MT |
| Description: |
* 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. |