Eddie Valiant: "That lame-brain freeway idea could only be cooked up by a toon."
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No it is not too late HYOH. Have fun.
I think it's a perfect time to start. Less crowds, beautiful flowers from the get go, great time to be in New England, and you can flip if you are running out of time. If you start May 5 at Springer, your chances of cold weather or snow in the far south are almost nil. NH and Maine in late September or October could be another matter, but you'll be tough as nails by then and so close to finishing that nothing will stop you. Besides, you'll be dazzled by the fall color!
I started my thru last year on April 28 and finished on Oct. 12. I missed most, but not all, of the bad spring weather. The weather last year in September and October in New England was absolutely perfect. No snow, no cold, and beautiful fall foliage. Of course, each year is different and it may be colder this year. You will be able to do bigger mileage than early starters because of longer days and better weather, so finishing in 5 months time should not be a problem. If I ever thru again, I would start no earlier than May 1.
As mentioned, if you begin to fear that you won't make it to Katahdin before the window closes, you can always flip and head up there early to start hiking southbound.
I will be starting on May 5th. I think it is the perfect time to start.
I'll also be a May start. I should see you out there. Plan to start the 10th-14th ish.