Vermont Public is independent, community-supported media, serving Vermont with trusted, relevant and essential information. We share stories that bring people together, from every corner of our region. New to Vermont Public? Start here.

© 2024 Vermont Public | 365 Troy Ave. Colchester, VT 05446

Public Files:

For assistance accessing our public files, please contact or call 802-655-9451.
Play Live Radio
Next Up:
0:00 0:00
Available On Air Stations

Exploring The Fleeting Freeze-Up Of Lake Champlain

A blue sky day and a wide shot of a snowy, frozen lake, with people walking on it in the background.
Henry Epp
A view of frozen Lake Champlain on Saturday, March 9.

Last week, the National Weather Service in Burlington made it official: Lake Champlain has fully frozen over for the first time since February 2015. However with Thursday temperatures forecast to reach the 50s, the full freeze might not last much longer.

"A frozen Lake Champlain is really a wonderful, beautiful thing," said Matthew Vaughan, an environmental analyst with the Lake Champlain Basin Program. "It's something that I hope for every year."

But this year marks just the third time that Lake Champlain has completely frozen over since 2010.

Vaughan said the lake used to freeze over frequently, but climate change and greenhouse gas emissions have made freeze-ups much more rare. He said that trend is likely to continue.

"We're seeing less frequent ice cover on our lakes in this region. And we're also seeing a definite trend of thawing happening earlier in the season — in the springtime for our smaller lakes in the region," Vaughan said. "So unfortunately I think this will be a more rare event in the future, although I hope to see it freeze up next year as well."

Looking down at the frozen ice surface of Lake Champlain.
Credit Henry Epp / VPR
This year marks just the third time that Lake Champlain has completely frozen over since 2010.

Vaughan broke down the science at work when the lake freezes:

"Water has a really unique property in that when it reaches its freezing point, it actually expands into something called a crystal lattice. And this crystal lattice causes ice to float over more dense liquid water — and this is why ice cubes float on top of your drink rather than sink to the bottom," Vaughan explained.

"So there's always that warmer water down below. So when there's a light breeze over the lake, it can pull energy away from the lake's surface, but if there's a stronger wind it will mix water with that warmer water down below and delay freezing. So when we have cold temperatures and a light breeze, it can let that ice set up."

Vaughan said ice thickness and stability can quickly change, so residents should be extremely cautious on the lake. "Remember that no ice is safe ice," he warned.

And how does the freeze impact the wildlife that calls the lake their home? According to Vaughan, they're able to deal with it.

"Our fish and wildlife are well adapted for cold winters and Lake Champlain freezover, and they do quite well under the ice," Vaughan said. "Fish metabolism actually slows down quite a bit in cold temperatures and they do just fine."

Man stands on a frozen lake.
Credit Henry Epp / VPR
Matthew Vaughan, an environmental analyst with the Lake Champlain Basin Program, stands Wednesday morning on frozen Lake Champlain.

Henry worked for Vermont Public as a reporter from 2017 to 2023.
Latest Stories