In their 2013 book on The Birds of New Hampshire, Keith and Fox listed late fall dates of individual Rose-breasted Grosbeaks on 8 Nov 1976 for Charlestown and on 9 Dec 2008 in Bradford (NH). Additionally, they noted a male at Concord from 14 to 24 November 1969. In a separate category for the winter months, they had six reports with dates ranging from 6 December to 2 April. For Vermont, Murin and Pfeiffer in their 2002 book on Birdwatching in Vermont included a graph indicating Rose-breasted Grosbeak as rare in the state after 10 Oct through the end of December and then unreported from January through to mid April.
A current online eBird graph indicates reports for Rose-breasted Grosbeak in New Hampshire for all months of the year except February and is thus slightly different from Keith and Fox who listed two reports from NH in February. A current eBird graph for Vermont indicates reports from every month of the year.
Rose-breasted Grosbeak has been a rarity in late fall, winter, or early spring in New Hampshire or Vermont. Rose-breasted Grosbeaks remaining as late as early November in northern New England have apparently not been shown to then successfully migrate southward, but, echoing Tom's question, has anyone ever closely examined this possibility?
George Clark
Norwich, VT
On Tue, 7 Nov 2023 21:33:33 +0000, "Sherry, Thomas W" wrote:
A friend in Lyme, NH, reported to me an “immature” (hatch-year) male Rose-breasted Grosbeak visiting their feeder frequently, for the past couple of weeks. This seems late for one to be hanging around…is it? Second question, is it likely just fattening up for further southward migration, and likely to survive? Does anyone have experience with this?
--Tom Sherry, WRJ, VT
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