Forster's Tern
Sterna forsteri
Sightings of Forster's Tern run from early January to late November, peaking early July.
Sighting 93 observationsMost recent: Jul 4, 202621 states/provinces
Sighting real observations of Forster's TernOpen in full map →
When it's seen
Share of Forster's Tern observations by week of the year, across its North American range.
early January
mid January
mid January
late January
early February
early February
mid February
late February
early March
early March
mid March
late March
late March
early April
mid April
mid April
late April
early May
early May
mid May
late May
late May
early June
mid June
late June
late June
early July
mid July
mid July
late July
early August
early August
mid August
late August
late August
early September
mid September
mid September
late September
early October
mid October
mid October
late October
early November
early November
mid November
late November
late November
early December
mid December
mid December
late December
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Where it's seen most
California45 →Florida11 →Alberta5 →Texas3 →Ontario3 →Ohio3 →Louisiana3 →Wisconsin2 →Delaware2 →Manitoba2 →Maryland2 →New Jersey2 →
Tap a state for Forster's Tern's local arrival & departure timing.
Data: iNaturalist research-grade observations (CC0 / CC-BY), via GBIF. Excludes eBird.