During summer they can be found breeding throughout the boreal coniferous forest. They breed nearer to the tundra than any other warbler. Studies have revealed that the spring migration is primarily overland whilst the autumn routes over water were dramatically different. In the fall the birds migrate from their breeding grounds across the northern latitudes. Traveling east they converge on the north-eastern United States south to Virginia where they fatten up feeding on berries, putting on up to 2g per day. Most Blackpolls then fly directly from north-eastern North America over the Atlantic Ocean to their winter range in the northern part of South America with some stopping in the Antilles. This route averages 3,000 km (1,900 miles) over water, requiring a potentially nonstop flight of around 72 to 88 hours. What an amazing feat for a small Nearctic warbler.
The first Blackpoll Warbler that I saw was on the Isles of Scilly one October back in the 1970's. Sightings on this side of the Atlantic were commoner then they are now. Sadly those days will never return.