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Cold spells are common during the last week of September, with the average first frosts noted at Montpelier, Newport, Readsboro, Rochester, Rutland, and St. Johnsbury all occurring between today and the weekend. Of course different hills and vales within any of these towns can be colder or warmer, causing the frost date to vary as much as 10 days to two weeks. The latest frosts occur in the Champlain Valley, about October 7th.