St. Lawrence River – Thousand Islands
St. Lawrence River – Thousand Islands is an Ontario fishing location near Thousand Islands, Eastern Ontario, targeted for Smallmouth Bass, Muskie, Pike. It sits in FMZ 20 (Lake Ontario & St. Lawrence River).
Fishing Quick Facts
- Location
- St. Lawrence River – Thousand Islands
- Waterbody
- St. Lawrence River
- Water type
- River
- Region
- Eastern Ontario
- Nearest town
- Thousand Islands
- Fishing Management Zone
- FMZ 20 — Lake Ontario & St. Lawrence River
- Latitude
- 44.32930
- Longitude
- -76.16520
- Primary species
- Smallmouth Bass, Muskie, Pike
- Other species
- Walleye
- Shore fishing
- Unknown
- Boat fishing
- Unknown
- Kayak / canoe
- Unknown
- Boat launch
- Unknown
- Ice fishing
- Unknown
- Parking
- Unknown
- Fishing regulations
- Ontario fishing rules and licences
- Official zone regulations
- Ontario MNRF FMZ 20 summary
- Live conditions
- Live Ontario fishing conditions and reports
About this water
Crystal-clear current with elite smallmouth and trophy muskie.
FMZ 20 regulations — Lake Ontario & St. Lawrence River
The Canadian waters of Lake Ontario, the Bay of Quinte, the Niagara River below Niagara Falls (the Lower Niagara), Hamilton Harbour and the St. Lawrence River. Deep cold water supports a world-class salmon and trout fishery, while eastern Lake Ontario and the upper St. Lawrence hold warm- and cool-water species.
- Chinook / coho salmon: open all year in the lake; tributaries have sanctuaries.
- Rainbow trout (steelhead): Apr 1 – Sept 30 & 4th Sat Nov – Mar 31 in tributaries.
- Walleye (Bay of Quinte): 3rd Sat in May – Feb 15; S-2/C-1 – 46 cm min.
- Smallmouth bass: last Sat in June – Nov 30; S-6/C-2.
Zone check: FMZ 20 set by review — Great Lakes water body: shore, harbour, river-mouth or connecting-channel access on Lake Ontario, the St. Lawrence River or the Niagara River below the falls. Coordinate falls on the land side of the mapped boundary, so the zone is set from the water actually fished. Reviewed 2026-08-12.
Summary only — always confirm current seasons and limits on the Ontario MNRF FMZ 20 page before your trip.
Seasonal availability
Open-season windows for the species found at St. Lawrence River – Thousand Islands, taken from the FMZ 20 regulation summary. Green months are within a published open season — they are not a prediction of how well fish will bite.
No FMZ 20 season line published in our summary for: Muskie, Pike. Check the official page before keeping these species.
Summary only, and seasons change annually. Confirm dates on the Ontario MNRF FMZ 20 page before your trip.
Solunar Calendar— St. Lawrence River – Thousand Islands
Waning Crescent
20% illuminated · Age 25.2d
🌘 Mon, Sep 7
20% · Rating 82🌘 Tue, Sep 8
12% · Rating 89🌘 Wed, Sep 9
6% · Rating 95Major windows (~2 h) cluster around moon transit and antitransit; minor windows (~1 h) around moonrise and moonset. Local approximations — verify against a printed almanac for planning.
Related fishing information
- How FMZ 20 works and which Ontario waters it covers
- Explore more fishing spots in Eastern Ontario
- Learn more about fishing for Smallmouth Bass in Ontario
- Learn more about fishing for Muskie in Ontario
- Learn more about fishing for Pike in Ontario
- Learn more about fishing for Walleye in Ontario
- Ontario fishing seasons, limits and licence rules
- Check live conditions before fishing St. Lawrence River – Thousand Islands
- Fishing near Thousand Islands: St. Lawrence River – 1000 Islands
- Fishing near Thousand Islands: Gananoque – Thousand Islands Launch
- Fishing near Thousand Islands: Grass Creek Park – St. Lawrence River
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