May 21 in strange history

What happened on May 21 in the world of UFOs, monsters and mysteries, plus 36 Canadian UFO sightings.

No famous case or old newspaper story we know of is dated May 21. Yet. Seen something on this date? Report it.

Canadian UFO sightings on May 21

The Canadian UFO Survey logged 36 sightings on May 21 between 1989 and today, most in 2009 (6). Most came from Ontario, Quebec, British Columbia.

2004 · St-Philippe, Quebec · Contact or abduction claim
Dark object seen, cat reacted, extreme sleepiness, dreams, weakness?
2016 · Sainte-Barbe, Quebec · Daylight disc, 3 witnesses
Photo of object shaped like a ring?
2024 · North Bay, Ontario · Daylight disc, 3 witnesses
CADORS 2024O1372 "bright object appeared to break up into multi-coloured pieces"
2018 · Portneuf, Quebec · Daylight disc, 2 witnesses
Photo: dark object moving slowly in distance at sunset
2023 · Montreal, Quebec · Physical traces
Photo: odd lights on doorbell cam?
2008 · Brantford, Ontario · Daylight disc
Odd object moving slow, then fast

Source: the Canadian UFO Survey, Ufology Research. Explore every Canadian sighting.

The US Air Force opened 758 Project Blue Book files for sightings in May, 1947 to 1969. Browse the Air Force files.