Dates Katahdin trails closed in recent years:
2022 10/20
2021 10/20
2020 10/17
2019 10/29
2018 10/21
2017 10/23
2016 10/24
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Yes, the Birches and Katahdin Stream stay open thru 10/22, weather permitting, but that doesn't guarantee a trail up will be open.
For many reasons, from services closing to the Kennebec Ferry season ending to short hours of daylight, I always advise NoBos to get to Baxter no later than the first week of October.