The natural skating rink at Beaver Lake and the toboggan runs that finish at the lake's edge are closed until further notice, the borough of Ville-Marie says.
The rink and the toboggan runs on Mont-Royal are among the city's most popular winter attractions.
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Borough spokeswoman Émilie Miskdjian told Radio-Canada that ice cover on the lake is not as thick as it needs to be to support park employees and maintenance machinery.
Tests of the ice around the edge of the lake revealed a void between the ice cover and the water.
The refrigerated rink at Beaver Lake, however, remains open to skaters.
The refrigerated rink next to Beaver Lake remains open but it is considerably smaller. pic.twitter.com/RKhksd2qXQ— @sarahleavittcbc
Experts hired by the borough will assess the situation and advise officials on options available for improving the ice cover.
"Their report will help us determine what measures are needed to allow safe access to the lake," Miskdjian said.
City says it's not sure when Beaver Lake will be open to skaters again. pic.twitter.com/Gub3HVLvHU— @sarahleavittcbc