I did Cabot via Bunnell 6/16-17/04. I believe I did a Trip Report with specifics. If not, I at least posted Trail Conditions with some info on the 17th.
From what I remember...
Directions: I missed the turn for 110 in Berlin. I still have no clue where it is! Ended up going around 110B&A which bit the big one, giving us a late start.
This is all from memory, so I hope I get this right...In the hatchery, go straight where the buildings are. The parking lot is on the right. You walk out of the lot, turn right, and look for the trail sign on the left, leaving the hatchery road to walk down a logging road. The trail turns right on the logging road with a sign (at least there's a sign for the turnoff to York Pond Trail that I remember). Go straight up the logging road. There will be a logging road turn off on the left. This is NOT the left turn in the AMC guide. You can find a small stone cairn on the right side of the trail here in the weeds indicating that you continue straight. The logging road with curve left and become overgrown. This is also NOT the left indicated in the guide. Just after the left curve you go thru a tight section with thorns, then the sign for the left turn will be on your left, where you turn onto a footpath. The bootsucking mudhole mentioned below is five minutes in on this section.
Bunnell Notch Trail: New terms were invented along this trail to describe the conditions. None of these terms are fit to print. It's EXTREMELY muddy in spots. As in two foot deep pits (literally). And it's rained so much lately. But, there was only one spot where we couldn't find footing (at the very beginning of the footpath). Poles are a MUST for probing for footing. Give yourself extra time as well -- the quagmires exist almost to the junction with the Kilkenny Ridge Trail. Other than that
, it's really not such a bad trail!
We went out the Unknown Pond Trail, which was MUCH better. There's even been so trail work done here to avoid the muddiest spots. I don't know what you agenda is, but this trail is a good option!
Please keep in mind that all this info is three month old. Who knows what's gone on up there since.
Good luck & happy hiking!