Cooling rivers set up a fall trout and smallmouth window

What's biting

What's next

Expect water temperatures to keep sliding with each cold night, and the coolest gauge at 53°F is the one to watch. As readings approach the low 50s, smallmouth shift from active chasing toward slower, deeper presentations, while trout become more aggressive and feed with less caution. A cool front often turns on a short, strong feeding spell, so the day or two after a front passes is worth planning around.

The New Moon means dark nights, and the stretches around dawn and dusk are the best bet for low-light feeding. Midday on bright days will likely be slower, so use that time to move between spots rather than grinding one hole.

Low flows favor lighter leaders, smaller profiles and quiet approaches. A rain event that bumps flow would briefly disperse fish and stain the water, but it often improves the bite once levels settle. Check state regulations and seasonal closures before keeping any fish, as rules for trout waters vary.

Context

Mid-October in the Merrimack basin and the Lake Winnipesaukee area is typically the middle of the fall transition. Surface waters have shed most of their summer heat, weed beds are thinning, and baitfish tend to concentrate in the remaining cover and along rocky edges. Trout in cooler rivers are generally moving toward pre-spawn behavior in the fall, while lake-dwelling smallmouth begin heading toward deeper wintering areas. Readings in the mid-50s are on schedule for the date, and the season's best stretch of comfortable, uncrowded fishing is usually now through the first hard frosts.