Alert archive / Colorado / Winter Storm Warnings in 2025

Winter Storm Warning 7, NWS Denver/Boulder, CO

December 4, 20259 counties in Colorado

NWS Denver/Boulder, CO issued this winter storm warning at Dec 4, 2025, 2:21 PM MST for 9 counties in Colorado. It took effect at Dec 5, 2025, 11:00 PM MST. It was in force for 24 hr. 55 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Dec 4, 2025, 2:21 PM MST (21:21 UTC)
In effect from: Dec 5, 2025, 11:00 PM MST
Expired: Dec 6, 2025, 11:00 PM MST
In force: 24 hr
Issued by: NWS Denver/Boulder, CO

Counties Boulder County, CO, Clear Creek County, CO, Gilpin County, CO, Grand County, CO, Jackson County, CO, Jefferson County, CO, Larimer County, CO, Park County, CO, Summit County, CO

The radar

The Denver radar (KFTG), 102 km from the middle of the area, began a volume at 21:24 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Dec 6, 7:00 AM MST	SNOW 2.1	1 W Allenspark, CO	Cocorahs station CO-BO-570 Allenspark 0.9 W.
Dec 6, 7:00 AM MST	SNOW 2.5	Rollinsville, CO	Cocorahs station CO-GL-23 Rollinsville 0.1 WNW.
Dec 6, 7:00 AM MST	SNOW 3	2 Ne Nederland, CO	Cocorahs station CO-BO-75 Nederland 2.61 NNE.
Dec 6, 7:00 AM MST	SNOW 3	Nederland, CO	Cocorahs station CO-BO-322 Nederland 0.4 WNW.
Dec 6, 7:00 AM MST	SNOW 4.4	3 Wnw Fairplay, CO	Cocorahs station CO-PK-15 Fairplay 2.7 WNW.
Dec 6, 7:00 AM MST	SNOW 6.5	9 Wnw Kremmling, CO	Cocorahs station CO-GR-77 Kremmling 9.1 WNW.
Dec 6, 7:00 AM MST	SNOW 8	10 Nw Kremmling, CO	Cocorahs station CO-GR-46 Kremmling 10.0 NW.
Dec 6, 7:30 AM MST	SNOW 2	1 Nnw Grant, CO	CO-OP Observer station GRTC2 Grant 1 W.
Dec 6, 8:00 AM MST	SNOW 3	1 N Lawson, CO	Cocorahs station CO-CC-32 1 N Lawson.
Dec 6, 8:00 AM MST	SNOW 9.2	3 Nnw Frisco, CO	Cocorahs station CO-SU-61 Silverthorne 2.8 SSW.
Dec 6, 8:30 AM MST	SNOW 9.1	2 Ssw Silverthorne, CO	Cocorahs station CO-SU-6 Silverthorne 2.1 WSW.
Dec 6, 9:00 AM MST	SNOW 2	1 N Walden, CO	CO-OP Observer station WLDC2 0.9 N Walden.
Dec 6, 9:00 AM MST	SNOW 5	1 Se Gould, CO	CO-OP Observer station CSFC2 1.1 SE Gould.
Dec 6, 9:00 AM MST	SNOW 5.3	1 Nw Dillon, CO
Dec 6, 6:06 PM MST	SNOW 2.4	8 Sse Rand, CO	WILLOW CREEK PASS SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 2.4	9 Se Weston Pass, CO	ROUGH AND TUMBLE SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 3.6	1 Ne Echo Lake, CO	ECHO LAKE SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 4.8	3 Sw Meeker Park, CO	COPELAND LAKE SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 6	3 Sw Ward, CO	NIWOT SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 7.2	3 Wnw Alma, CO	BUCKSKIN JOE SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 7.2	5 W Green Mountain Rese, CO	ELLIOT RIDGE SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 8.4	3 Wnw Pingree Park, CO	HOURGLASS LAKE SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 8.4	6 Nw Silverthorne, CO	SUMMIT RANCH SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 8.4	7 Nw Red Feather Lakes, CO	BLACK MOUNTAIN SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 9.6	10 Nne Silverthorne, CO	MIDDLE FORK CAMP SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 9.6	1 Wnw Loveland Pass, CO	LOVELAND BASIN SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 9.6	5 Ssw Glendevey, CO	RAWAH SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 9.6	8 Sse Cameron Pass, CO	PHANTOM VALLEY SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 9.6	9 Sse Gould, CO	NEVER SUMMER SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 10.8	5 Wsw Grand Lake, CO	STILLWATER CREEK SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 10.8	5 Wsw Guanella Pass, CO	JACKWHACKER GULCH SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 12	1 Nnw Cameron Pass, CO	JOE WRIGHT SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 12	1 Nw Climax, CO	FREMONT PASS SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 12	3 S Brainard Lake, CO	UNIVERSITY CAMP SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 12	4 S Longs Peak, CO	WILD BASIN SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 12	5 W Berthoud Falls, CO	JONES PASS SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 12	7 E Blue River, CO	MICHIGAN CREEK SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 13.2	11 S Rabbit Ears Pass, CO	BUFFALO PARK SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 13.2	1 W Copper Mountain, CO	COPPER MOUNTAIN SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 13.2	4 Nnw Longs Peak, CO	BEAR LAKE SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 13.2	5 Ssw Blue River, CO	HOOSIER PASS SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 13.2	5 Wsw Winter Park, CO	FOOL CREEK SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 13.2	6 E Cameron Pass, CO	LONG DRAW RESERVOIR SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 13.2	8 Nw Glendevey, CO	ROACH SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 14.4	1 Sw Eldora, CO	LAKE ELDORA SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 14.4	9 Se Cameron Pass, CO	WILLOW PARK SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 16.8	1 Sse Loveland Pass, CO	GRIZZLY PEAK SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 16.8	7 Sse Cameron Pass, CO	LAKE IRENE SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 16.8	9 E Glendevey, CO	DEADMAN HILL SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 18	1 Nnw Berthoud Pass, CO	BERTHOUD SUMMIT SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 19.2	9 Sse Spicer, CO	ARAPAHO RIDGE SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 20.4	6 W Arapahoe Peak, CO	HIGH LONESOME SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 22.8	3 Nne Mount Audubon, CO	SAWTOOTH SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 27.6	1 Nne Rabbit Ears Pass, CO	COLUMBINE SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO
Dec 6, 6:06 PM MST	SNOW 33.6	4 Se Mount Zirkel, CO	ZIRKEL SNOTEL SNOWFALL BETWEEN 5 AM 12/05/2025 AND 4 PM 12/06/2025 ESTIMATED USING A 12.0 TO 1 SNOW-TO-LIQUID RATIO

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

What forecasters said that day

The local office's own words before this winter storm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Denver/Boulder, CO wrote its last area forecast discussion before this winter storm warning went out at Dec 4, 10:36 AM MST, 3 hours 45 minutes earlier.

Area forecast discussion, Dec 4, 10:36 AM MST, 3 hours 45 minutes before

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Hazardous weather outlook, Dec 4, 11:29 AM MST, 2 hours 52 minutes before

Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
1129 AM MST Thu Dec 4 2025

COZ030>051-051830-
Jackson County Below 9000 Feet-
West Jackson and West Grand Counties Above 9000 Feet-
Grand and Summit Counties Below 9000 Feet-
South and East Jackson/Larimer/North and Northeast Grand/
Northwest Boulder Counties Above 9000 Feet-
South and Southeast Grand/West Central and Southwest Boulder/
Gilpin/Clear Creek/Summit/North and West Park Counties Above
9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet-
Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear
Creek/Northeast Park Counties Below 9000 Feet-
Central and Southeast Park County-
Larimer County Below 6000 Feet/Northwest Weld County-
Boulder And Jefferson Counties Below 6000 Feet/West Broomfield
County-
North Douglas County Below 6000 Feet/Denver/West Adams and
Arapahoe Counties/East Broomfield County-
Elbert/Central and East Douglas Counties Above 6000 Feet-
Northeast Weld County-Central and South Weld County-Morgan County-
Central and East Adams and Arapahoe Counties-
North and Northeast Elbert County Below 6000 Feet/North Lincoln
County-
Southeast Elbert County Below 6000 Feet/South Lincoln County-
Logan County-Washington County-Sedgwick County-Phillips County-
1129 AM MST Thu Dec 4 2025

This hazardous weather outlook is for northeast and north central
Colorado.

.DAY ONE...Today and Tonight

Snow returns to the northern mountains tonight, heaviest towards
Rabbit Ears Pass. Roads are expected to become slick and hazardous
overnight in the mountains.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Additional mountain snow is expected Friday evening through
Sunday morning. Travel could be very difficult across the
mountains Friday night through Sunday morning, due to heavy
snowfall and blowing snow.

Across the plains, dry conditions are expected this weekend into
next week, with a gradual warming trend likely.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today or tonight.

In the hours before

Local storm report, Dec 4, 10:38 AM MST, 3 hours 43 minutes before

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The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 3, 9:22 PM MST	Dense Fog Advisory	BOU	Larimer, Morgan, Weld	13 hr
Dec 4, 2:20 AM MST	Winter Storm Watch	BOU	Boulder, Clear Creek, Gilpin, Grand, Jackson, Jefferson and 3 more	12 hr
Dec 4, 2:20 AM MST	Winter Weather Advisory	BOU	Grand, Jackson	45 hr

Nearby

Winter Storm Warnings in Colorado, 2025 Every winter storm warning in 2025

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; radar from the NEXRAD Level II archive.