Unless posted otherwise, the MAXIMUM speed on any snowmobile trail in New Hampshire is:
Certain areas are posted with lower speed limits.
Please be careful and slow down in these areas.
Sharp turns, logging areas, steep hills, trail junctions, bridges, etc.
should all be approached with caution.
There may be someone coming the other way.
Back Lake has a night time speed limit of 35 MPH
From 1/2 hour after sunset to 1/2 hour before sunrise, (night time) the speed limit on Back Lake is 35 MPH, it is NH State Law. The law is in place to reduce unsafe speeds at night that has resulted in fatal accidents in the past on Back Lake.
Stay safe and ride slow on the lakes at night!