The leaves start to turn at different times for different areas and tend to peak at different times as well. Here's an idea for a bit of research:

I did a wee bit of searching (www.google.ca & used the search command "autumn foliage tracking") and came up with this from Toronto's Globe & Mail newspaper:


LEAF-TRACKING WEBSITES

To ensure scenic autumn trips, visit the following websites, which track the turning foliage across North America's most colourful regions:

NOVA SCOTIA: Novascotia.com/season/fall/leaf.htm delivers "Leaf Watch" information on five travel routes from the Nova Scotia Department of Tourism.

ONTARIO: The on-line Fall Foliage Progression Report at Ontariotravel.net/publications/fallcolourreport.pdf is updated on Mondays and Thursdays during the fall season, and features a regional breakdown.

QUEBEC: The Belle Province's foliage website -- bonjourquebec.com/ca-en/symphoniecouleurs0.html -- is perhaps the best of the lot, with a handy chart summarizing the percentage of colouring and types of colours seen in dozens of cities, parks and regions.
The Globe and Mail

NEW BRUNSWICK: The text-based site at nbtreehouse.ca/programs/ autumncolours.html, published by Fredericton-based forest-management advocacy group the Tree House, is updated on Wednesdays and describes the progression of fall colours in various parts of New Brunswick.