Thursday, May 21, 2026

Thursday Evening Vermont Frost Update: Protect Your Plants Almost Everywhere In Vermont

Visible satellite photo has clear skies in northern and
central Vermont and high clouds south late this
afternoon. Many of those high clouds are expected 
to clear, so frost and freezes are likely in most\
of Vermont tonight and early Friday.
It's a gorgeous late afternoon, especially north, where the landscape features clear blue skies and the greening hills and mountains around us. 

Southern Vermont has quite a few high clouds. They might save the day, or I should say night, and prevent frost down there. But chances are better than even, allowing a frost risk all the way down to the Massachusetts border.

Frost, if not a freeze, is a given tonight and early Friday in northern Vermont away from Lake Champlain .

The Northeast Kingdom is still under a freeze warning, as it was this morning. But that freeze warning has been extended to all of northern Vermont east of the Green Mountains. Temperatures are forecast to be a little colder there than forecasters thought during this morning. The forecast low in Montpelier tonight is 29 or 30 degrees.Their record low tomorrow morning, by the way, is 29 degrees. 

The rest of Vermont outside the Champlain Valley is under a frost advisory for temperatures in the low to mid 30s overnight. 

Despite a lack of any advisories or warnings in the central and northern Champlain Valley, I still wonder if there might be some patches of frost. I think that might happen in spots, especially near and east of Route 7. Just to be safe, I'd cover up or bring sensitive plants in, unless you're right near Lake Champlain.  If you don't get a frost, it'll be no big deal to remove the covers tomorrow morning. 

As of 4 p.m. the dew point was between 27 and 30 across most of Vermont. The dew point is the temperature we have to cool down to get water droplets and dew.

The dew point is a good, but imperfect predictor of frosts and freezes.  If skies remain clear and wind stays calm tonight, that dew point means it can easily get to near freezing tonight across most of Vermont. 

So yup, dig out the sheets, cover all those brand new frost-prone plants you have and hope for the best. If you have a strong back, haul those big tropical potted plants back indoors if you're in the potential freeze zone. You know the drill

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