Winter Storm Warning Issued: Up to 3 Feet of Snow Expected in Northern Rockies This June

Why This Is Happening

This late-June winter event is being caused by a sharp southward plunge of the jet stream, dragging unseasonably cold air from Canada deep into the Northwestern United States. The National Weather Service describes this as a "sharp colder pattern" that moved into the Northwest and northern Rockies, peaking over the weekend and lingering into Tuesday.

What Makes This Unusual

While snow in June is not entirely unprecedented in the high country of the northern Rockies — similar events occurred in June 2023, 2020, and 2019 — the severity and official warnings attached to this system are noteworthy. Forecasters at the weather service noted that a winter storm warning in late June is a "very much rare occurrence."

The timing is especially striking: this storm arrives just as millions of Americans prepare for the 250th birthday of the United States on July 4th. National parks including Yellowstone, Grand Teton, and Glacier — which just opened its full-length Going-to-the-Sun Road for the summer season — will be directly affected.

Affected Areas

Why This Matters

This weather event poses real risks to both residents and the thousands of tourists expected to visit national parks during the holiday week. Hypothermia is a genuine concern for campers and hikers caught unprepared. Heavy, wet snow can down trees and block backcountry roads, potentially stranding travelers. The dramatic temperature swing — from 90°F summer heat to 30°F winter cold in a matter of days — also puts infrastructure and agriculture at risk.

Historical Context

The cold is forecast to challenge record books that have stood for decades. Pocatello, Idaho, faces potential record lows set in 1965 and 1969. Rexburg could break records from 1998 and 2014. Other cities including Idaho Falls are expected to come within 2-3 degrees of their own all-time June lows.

Is snow in June normal for the northern Rockies?

While mountain snow in late June is not entirely unusual for the high elevations, the issuance of an official winter storm warning is considered very rare. The region has seen June snow before — in 2023, 2020, and 2019, for example — but the current system's intensity and the accompanying record cold temperatures make this event exceptional.

How should I prepare if I'm traveling to Yellowstone, Grand Teton, or Glacier National Park this weekend?

Dress for cold, wet weather — bring rain gear, sweatshirts, long pants, and winter clothing if camping or hiking in the backcountry. Check national park websites for road and trail closures. Consider delaying backcountry travel. If travel is absolutely necessary, carry a winter survival kit including tire chains, booster cables, flashlight, shovel, blankets, extra clothing, water, and a first aid kit.

How long will the cold weather last?

The cold pattern is expected to peak this weekend and linger through Monday, possibly into Tuesday. Warmer conditions are forecast to return starting Tuesday, ending what forecasters describe as "one of the stranger stretches of East Idaho weather in years."

Will lower elevations see snow too?

Snow is primarily expected above 6,000-6,500 feet in Montana and Idaho, and above 8,000 feet in Wyoming. Lower elevations will see cold rain, clouds, and possible thunderstorms, with temperatures falling into the high 30s and low 40s at night.

Have you ever experienced snow in June? How are you preparing for this unusual winter storm in the northern Rockies? Share your thoughts and experiences below!

Do you think this kind of extreme temperature swing is becoming more common? Let us know in the comments.

*Share this article with others who are traveling to the northern Rockies this week or planning 4th of July trips to national parks — they need to know what to expect!*

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