17 days has always been my number for 9 years, and most years average 2.5 successful fledgings. I believe one time I had one late fledge the next day. By the way I am in mid-Missouri so I imagine our weather patters are similar. My pair of blues were VERY late this year – just now in the 7th day of incubation and usually I would have had some fledge by now.
