Increasing northerly flow reinforced by a cold arctic airmass behind a shortwave trough passage starting October 26th lead to temperatures region-wide dropping well below normal. Overnight temperatures across the lower elevations in the intermountain Pacific Northwest were able to cool well below freezing across much the region for much of the overnight period. This lead to all lower elevation zones experiencing their end of season freeze by the morning of October 28th.

Frost/Freeze in JOHN DAY BASIN, OREGON
From 26-OCT-23 20:56:00 to 27-OCT-23 08:15:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The mesonet station CW2286 Monument recorded temperatures at or below 32 degrees for approximately 9 hours starting at 0000 PDT. The USCRN site SHRO3 recorded temperatures at or below 32 degrees for approximately 9 hours starting at 2210 PDT. The Oregon DOT station OD200 recorded temperatures at or below 32 degrees for approximately 11 hours starting at 2156 PDT.

Frost/Freeze in CENTRAL OREGON, OREGON
From 25-OCT-23 23:10:00 to 26-OCT-23 08:10:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The ASOS KRDM recorded temperatures at or below 32 degrees for approximately 9 hours ending 0910 PDT. The AWOS KS33 Madras recorded temperatures at or below 32 degrees for approximately 8 hour ending 0855 PDT. The AWOS KBDN recorded temperatures at or below 32 degrees for approximately 7 hours ending 0850 PDT. Most stations in the zone recorded morning low temperatures below 28 degrees.

Frost/Freeze in FOOTHILLS OF THE SOUTHERN BLUE MOUNTAINS OF OREGON, OREGON
From 27-OCT-23 18:15:00 to 28-OCT-23 09:15:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The AWOS K9S9 Lexington recorded temperatures at or below 32 degrees for approximately 14 hours ending 0955 PDT. The mesonet station CW5615 Heppner recorded temperatures at or below 32 degrees for approximately 15 hours ending 1015 PDT. The mesonet station DW1028 Ajax recorded temperatures at or below 32 degrees for approximately 12 hours ending 1001 PDT. Most stations across the zone recorded morning lows less than 28 degrees.

Frost/Freeze in NORTH CENTRAL OREGON, OREGON
From 27-OCT-23 17:30:00 to 28-OCT-23 10:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The mesonet station FW0649 Dufur recorded temperatures at or below 32 degrees for approximately 14 hours ending 1001 PDT. The Oregon DOT station ODT41 at Wasco recorded temperatures at or below 32 degrees for approximately 12 hours ending 0916 PDT. The mesonet station FW9671 Maupin recorded temperatures at or below 32 degrees for approximately 13 hours ending 1045 PDT. Most stations across the zone reported morning lows less than 28 degrees.

Frost/Freeze in LOWER COLUMBIA BASIN, OREGON
From 27-OCT-23 18:16:00 to 28-OCT-23 08:25:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The ASOS KHRI recorded temperatures at or below 32 degrees for approximately 12 hours ending at 0935 PDT. The Umatilla RAWS recorded temperatures at or below 32 degrees for approximately 9 hours ending 0829 PDT. The mesonet station CW1075 Boardman recorded temperatures at or below 32 degrees for approximately 7 hours ending 0930 PDT. The mesonet station CW2444 Echo recorded temperatures at or below 32 degrees for approximately 14 hours ending 0930 PDT. Most stations in the zone recorded morning low temperatures below 28 degrees.

Frost/Freeze in FOOTHILLS OF THE NORTHERN BLUE MOUNTAINS OF OREGON, OREGON
From 27-OCT-23 20:15:00 to 28-OCT-23 09:46:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The ASOS KPDT recorded temperatures at or below 32 degrees for approximately 11 hours ending at 1015 PDT. The Oregon DOT station OD191 recorded temperatures at or below 32 degrees for approximately 11 hours ending at 1046 PDT. The mesonet station DW9612 Umapine recorded temperatures at or below 32 degrees for approximately 11 hours ending at 0931 PDT. The Mesonet station EW7174 Adams4w recorded temperatures at or below 32 degrees for approximately 13 hours ending at 1015 PDT. Most stations in the zone recorded morning low temperatrues below 28 degrees.

Frost/Freeze in EASTERN COLUMBIA RIVER GORGE, OREGON
From 27-OCT-23 20:45:00 to 28-OCT-23 08:35:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The mesonet station FW4346 Arlington recorded temperatures at or below 32 degrees for approximately 11 hours ending at 0945 PDT. The mesonet station EW3497 The Dalles recorded temperatures at or below 32 degrees for approximately 11 hours ending at 1017 PDT. The Oregon DOT station ODT17 recorded temperatures at or below 32 degrees for approximately 5 hours ending at 0936 PDT.