Cheyenne, WY – Wyoming may be in for a harsher winter than usual, as the 2025-26 Winter Weather Outlook signals an elevated risk of heavy snowfall and disruptive storms across the state from December through February.
According to the National Weather Service (NWS) Climate Prediction Center, weak La Niña conditions are developing this fall, likely transitioning toward a neutral phase in early 2026. Historically, this pattern favors colder air outbreaks and active storm tracks across the Northern Rockies and High Plains — often translating to above-average snowfall in Wyoming.
Meteorologists stress that the forecast is preliminary, with plenty of uncertainty. Short-term climate drivers such as the Arctic Oscillation (AO) and Madden-Julian Oscillation (MJO) can change storm timing and intensity quickly, producing stretches of quiet weather followed by sudden bursts of heavy snow.
Still, the early signal leans toward greater snowfall potential statewide. Northwestern Wyoming, including Yellowstone and the Teton Range, could see prolonged heavy mountain snow, while central and southern areas such as Casper and Cheyenne may face repeated storm systems delivering several inches at a time. Eastern Wyoming, often exposed to windswept conditions, could experience blizzard-like impacts even from moderate snowfalls.
Historical trends show the range of possibilities. Past La Niña and neutral winters brought anywhere from 30 inches to more than 90 inches of snow across various parts of the state. That variability highlights the challenge of long-term forecasting — and why officials recommend preparing for a more active winter regardless.
Travel disruptions remain a key concern. Interstate corridors including I-25, I-80, and I-90 are prone to closures during snow and high-wind events, with whiteouts across open plains posing serious hazards. The risk of travel delays is expected to peak in January and February, when storm activity is typically strongest.
The official winter forecast will be issued October 16, but Wyoming residents are urged to prepare now. That means checking furnaces, stocking up on rock salt and snow shovels, winterizing vehicles, and assembling emergency kits with food, water, and blankets.
