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New Hampshire

First Connecticut Lake

First Connecticut Lake is a 3,071-acre cold-water lake in Coos County, New Hampshire, with a late, compressed largemouth season.

Surface
3,071acres
Primary species
Largemouth
§ 01Today on the water · First Connecticut Lakevia Open-Meteo · 18:45 local
Air temp
69.6°F
Barometric
30.02″
→steady 24h(-0.04)
Wind
5mph
from E
Moon
Waning Gibbous
day 19.4 · 77% lit

Air conditions sampled near the lake center, not measured on the water · refreshed ~15 min

§ 03Next 3 daysvia Open-Meteo · interpretation
  1. 1
    sepTue

    Stable window

    hi 70° · lo 46°

    Anytime through the day. Quiet weather day; lean on seasonal pattern and structure.

    ── light e wind · settled

  2. 2
    sepWed

    Watch the wind

    hi 67° · lo 54°

    Lean into wind-fed shorelines, all day. Wind drives bait position today; pick the shoreline taking it.

    ── stiff se wind

  3. 3
    sepThu

    Better early

    hi 62° · lo 54°

    Pre-dawn through 9am. Get on the water before the front; the bite likely shrinks once precip starts.

    ── front rolling in · se wind setting up

§ 04Field notesNew Hampshire

Where it is

First Connecticut Lake sits in Coos County, New Hampshire, covering about 3,071 acres. The fish move with the calendar, and the productive water moves with the fish.

Seasonal pattern

Spring. In Coos County, near the top of New Hampshire, First Connecticut Lake stays cold late — the largemouth calendar here starts weeks behind southern waters, with staging and spawning packed into late spring.

Summer. The 3,071-acre lake's short summer is its best stretch: fish work weed edges and warm coves hard while the warmth lasts.

Fall. The season closes early; a sharp September-style feed fades fast as the North Country cools.

Winter. A long, hard, frozen off-season — open-water patterns are done until well after ice-out.

Key structure

  • Creek and cove mouths that funnel fish and bait
  • Weed edges and the clean lines along them
  • Inside turns where a bank changes angle
  • Submerged wood, brush, and laydown cover

The calendar decides which of these is worth time on a given day.

Forage

The forage base on First Connecticut Lake is baitfish and panfish; largemouth stay with those schools as they shift.

Access

Public launch points exist around First Connecticut Lake; verify current conditions and water levels through local sources before a trip.

Regulations

Check current state and local regulations before fishing; limits and seasons can change.

§ 05Sources & field guides

Field guides

Data & references

  • Today's conditions — Open-Meteo, refreshed every ~15 min
  • Moon phase — local astronomical calculation, no external API
  • Lake area, depth, structure — Identity, surface area, coordinates and county/state are from the ProjectD canonical waterbody index (snapshot conus-20260518-v1, group gnis:00866872). Maximum depth and regulation links were not available from an acceptable source and are intentionally omitted.
  • Regulations — verify current state and local regulations before fishing

Last revised · Back to Lake Guide