Parks Canada says the townsite in Waterton Lakes National Park is no longer under immediate threat from a wildfire burning in the park.
But there are still flames in area and the southwestern Alberta park remains closed to all traffic except emergency vehicles.
The estimated size of the Kenow fire is 350 square kilometres, more than triple the area it covered just two days ago.
Parks Canada says conditions are getting more favourable, with cooler temperatures, higher relative humidity and northeast winds in the forecast.
It also says rain was expected later, which could provide further relief.
However, it cautioned that because conditions have been so dry, intense fire behaviour is possible.
Though the townsite has been spared, the fire destroyed the park’s visitor centre and some other buildings.
Some 500 people remain under evacuation orders in the Waterton townsite and parts of Cardston County, the Municipal District of Pincher Creek and the Blood Reserve, a First Nations community southwest of Lethbridge.