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Operational weather around the selected lakeThaw signal
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NASA imagery is visual evidence. Step through dates to distinguish persistent lake ice from cloud.
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Tap a lake to switch the map and outlookCompare lakes
How to use the ice-out outlook
Find a lake, choose a target date, and compare the probability window with the historical baseline. The interactive forecast loads after the page opens; a loading message is not an ice-out observation. During spring breakup, available weather and validated thaw signals can adjust the outlook. Outside that season, use the next spring outlook as planning context, rather than treating today's weather as a months-ahead prediction.
Use the satellite date control to compare images, keeping cloud cover separate from lake ice. For wider spring context, compare measured snowpack and snowmelt and river gauge conditions. Neither establishes that a particular lake is ice-free. Check local observations before making a trip decision.
Data and forecast method
Lake names come from authoritative national sources: USGS GNIS in the United States and Natural Resources Canada’s Canadian Geographical Names Database in Canada. Search runs through the same lake-search endpoint for both countries.
Where an unambiguous HydroLAKES match exists, the model adds lake area, estimated mean depth, elevation, shoreline development and volume. Historical ice-out observations are attached only when the match is safe; otherwise nearby long-record lakes provide regional calibration.
During active spring breakup, validated seasonal freezing/thaw physics and operational NWS or ECCC weather can adjust the historical baseline. NASA GIBS imagery is shown as visual evidence rather than converted into an unsupported open-water percentage.
Not an ice-safety tool. Ice-out probability does not estimate ice thickness or whether ice can support people, vehicles or equipment.