Canberra make sure you rug up, and prepare to get the credit card out to scrape the frost off your windshields.

The territory is expecting a dusting of snow on the Brindabella Mountains as temperatures plummet to a low of minus 7 over the weekend.

There's been plenty of frost on the field this week at Canberra's Thoroughbred Park race course Credit:Karleen Minney

"We're expecting a pretty chilly one," said Bureau of Meteorology forecaster Rosemary Barr.

"A cold front will be moving across the state late on Friday and there'll be a high pressure system behind that."