RIVERTON, Wyo. – A sharp early-October chill grips central and western Wyoming as a Freeze Watch remains in effect through Tuesday morning, threatening tender crops, outdoor pipes, and late-season gardens. Subfreezing temperatures as low as 30°F could sweep across Lander, Riverton, and the Wind River Basin.
According to the National Weather Service in Riverton, the freeze risk begins late Sunday and extends through early Tuesday, with the coldest readings in low valleys and sheltered rural areas. Motorists along I-25 and I-80 may encounter slick bridge surfaces and patchy frost early Monday. Residents are urged to protect outdoor plumbing, wrap exposed pipes, and bring potted plants indoors.
By Monday afternoon, skies clear and sunshine returns, kicking off a brighter, calmer stretch. Highs rebound into the upper 50s and 60s by midweek, ideal for fall hikes, pumpkin patch visits, or Halloween yard prep. Warm afternoons and crisp nights define the week ahead — a reminder that Wyoming’s deep autumn chill has firmly arrived.
The NWS also cautions ranchers and gardeners across Fremont, Johnson, and Natrona Counties to monitor sensitive vegetation and cover exposed crops tonight. Winds remain light, and no additional storms are expected through Thursday.
Expect another push of cool air next weekend, but for now, dry and sunny skies will dominate central Wyoming’s early-October weather.
Five-Day Forecast for Riverton, WY:
Sun: 52/34 – Rain early; turning cooler.
Mon: 54/30 – Mostly sunny; early freeze risk.
Tue: 60/31 – Sunny; frost possible dawn hours.
Wed: 68/35 – Sunny, calm winds.
Thu: 69/37 – Mild, bright; perfect for fall decorating.
