Durham Region observing spot popular with the Toronto-area astronomy clubs.
Updated:
· Tonight: Friday, August 14, 2026
📍 Durham, ON🌑 Bortle 4🚗 ≈ 1.5 hours east via Highways 401 and 35/115.📅 Conservation area since 1972; long-running observing site for the Durham Region Astronomical Association.
About Long Sault
Long Sault sits on the Oak Ridges Moraine, which is a quietly important fact: the moraine is high ground, and high ground above Lake Ontario means you're looking down on a thin layer of haze rather than through it. Bortle 4 isn't pristine, but the open hilltop fields catch a real southern view and the Durham Region Astronomical Association has worn a path here for a reason — it's the closest meaningful step away from Toronto's dome that you can do as a school-night drive.
What you can see in the sky
Brighter Milky Way star clouds, Andromeda, Pleiades, planetary opposition viewing.
Best time of year
October through March — leaves are off the trees opening up the horizon, the air dries out, and the sun sets early enough that you don't have to commit a whole night.
Why this site is worth the drive
Open hilltop fields with a usable south horizon
Frequented by the Durham Region Astronomical Association
Quiet enough for astrophotography sessions
Practical tips for Long Sault
Park gate hours change seasonally — confirm before driving out
Bring a portable shelter; the hilltop is exposed to wind
Look north-east for the darkest direction — Toronto's dome dominates the south-west
Live 48-hour forecast
Tonight's verdict above is a build-time snapshot. For the full
hourly view — cloud cover, transparency, seeing, smoke, humidity,
moon altitude and a Bortle-aware tonight score by observing mode
(visual, deep-sky, planetary, astrophoto) — open the live forecast:
The live page combines Open-Meteo weather, US-AQI wildfire smoke,
moon math and Bortle-scale darkness into a single tonight score
(0–100), updated continuously.
Frequently asked questions
Is Long Sault good for stargazing tonight?
Tonight's verdict is Fair (Medium confidence). Short 3h window, otherwise mean cloud 57%. Worth a look if you're nearby.
When is the best time of year to stargaze at Long Sault?
October through March — leaves are off the trees opening up the horizon, the air dries out, and the sun sets early enough that you don't have to commit a whole night.
How long is the drive from Toronto?
≈ 1.5 hours east via Highways 401 and 35/115.
What can I see in the sky here?
Brighter Milky Way star clouds, Andromeda, Pleiades, planetary opposition viewing.
How dark is the sky? (Bortle scale)
Long Sault sits at Bortle class 4 on the 1–9 dark-sky scale, where 1 is a pristine wilderness sky and 9 is an inner-city sky.