Live aurora forecast

Northern lights in Ontario tonight

Ontario, Canada · 54° magnetic latitude · Kp 5 threshold

Aurora visibility · Ontario
6/9
Possible tonight

Kp 6 is at the threshold for Ontario. Aurora may be visible from a dark site if cloud cover permits.

QuietStormExtreme
Threshold
Kp 5
Magnetic latitude
~54°N
Bz ↓ south
- nT
Solar wind
- km/s
Density
- p/cm³
Cloud
-
Conditions right now: - Kp + Bz + solar wind + cloud + moon

Updated: 5 Jul, 09:16 UTC

7-day outlook for Ontario

Today
5 Jul
6
Possible
Tomorrow
6 Jul
3
Quiet
Tue
7 Jul
3
Quiet
Wed
8 Jul
3
Quiet
Thu
9 Jul
3
Quiet
Fri
10 Jul
3
Quiet
Sat
11 Jul
3
Quiet

Based on CME arrival predictions from NASA DONKI. Arrival times ±6 hours.

auroratonight.space

What Kp is needed here?

Ontario sits at a magnetic latitude of approximately 54°N. The Kp index - a global measure of geomagnetic activity on a scale from 0 (quiet) to 9 (extreme storm), updated every 3 hours - needs to reach Kp 5 before the auroral oval expands far enough south to be visible from here.

At Kp 5, visibility is possible from Ontario but skies need to be clear and dark. Cloud cover and light pollution remain the main obstacles even when Kp is high enough.

Plan your viewing

Best dark sky sites near Ontario

Light pollution is the biggest obstacle after cloud cover. These sites give you the best dark northern horizon within reach.

Killarney Provincial Park

Get directions ↗
Bortle Class 2–3 - Excellent dark sky 230 km from Toronto - approximately 3 hour drive

A wilderness park on the north shore of Georgian Bay, long recognised as one of Ontario's finest dark sky destinations. The quartzite ridges of the La Cloche Mountains rise above lakes that hold perfect reflections on a still night. The north-facing shore opens over open water toward Sudbury with minimal light pollution. Camping at George Lake or Killarney Lake gives front-door access to the dark sky. The Sudbury page covers the dedicated north shore experience.

Torrance Barrens Dark Sky Reserve

Get directions ↗
Bortle Class 2–3 - Excellent dark sky 165 km from Toronto - approximately 2 hour drive

Ontario's only formally designated Dark Sky Reserve, managed by the Royal Astronomical Society of Canada. The open rocky barrens of the Canadian Shield plateau give 360-degree sky access with no forest obstruction. The reserve lies in Muskoka, a cottage country region 2 hours north of Toronto. Several public parking areas provide access to the flat rock pavements. One of the most accessible genuinely dark sites for southern Ontario aurora watchers.

Algonquin Provincial Park

Get directions ↗
Bortle Class 3–4 - Rural sky 260 km from Toronto - approximately 3 hour drive

Ontario's oldest and best-known provincial park covers 7,700 km² of highland forest and lake country. The plateau elevation (400–500 m) lifts observers above valley mist and the park's interior lakes give open northern sky away from any town light dome. Highway 60 through the park is accessible year-round. Canoe Lake, Cache Lake, and Opeongo Lake give north-facing water foregrounds for photography. Kp 5 reaches this latitude several times per year during the current solar maximum.

When to go

Best time to see the northern lights in Ontario

At 54°N magnetic latitude, Ontario sits at the lower end of regular aurora territory. Only the deep mid-winter months of November through January offer nights dark enough for aurora to be visible, and only then when a significant geomagnetic storm pushes the auroral oval this far south.

Activity peaks around the September and March equinoxes, when Earth's magnetic field geometry is most favourable for coupling with the solar wind. Events during these two windows tend to produce the strongest displays of the year for observers at Ontario's latitude.

Outside November through January, twilight is too bright for aurora viewing even during significant storms. The season is short, but the equinox months on either side of winter can extend it slightly when storm timing aligns.

Up to 8 locations

Ontario

Canada

Possible
Kp 6 need Kp 5
Checking darkness…
Thunder Bay

Canada

Good chance
Kp 6 need Kp 3-4
Checking darkness…
Sudbury

Canada

Possible
Kp 6 need Kp 5
Checking darkness…
The odds

How often does the aurora appear in Ontario?

Average nights per month the Kp reached Ontario's threshold of 5+, from 15 years of geomagnetic data (2010–2024).

1.2Jan
1.3Feb
1.6Mar
1.4Apr
1.2May
1Jun
1.2Jul
1.4Aug
1.5Sep
1.5Oct
1.2Nov
1.1Dec

Counts the Kp 5+ threshold only - cloud cover and local darkness are not included.
Kp data: GFZ German Research Centre for Geosciences, CC BY 4.0

Make it happen

Plan your trip to Ontario

Based on 15 years of geomagnetic data (2010–2024)

1st
March
1.6
avg aurora nights
Requires an extended stay
2nd
September
1.5
avg aurora nights
Requires an extended stay
3rd
October
1.5
avg aurora nights
Requires an extended stay

Best window

The August to October window averages 4 aurora nights - the strongest consecutive stretch of the year.

How long to stay

Aurora at this latitude requires patience - allow as many nights as possible during March.

From the community

Aurora photographs from Ontario

Real photos sourced from Wikimedia Commons.

Aurora over OntarioAurora over Ontario
Aurora over OntarioAurora over Ontario
Aurora over OntarioAurora over Ontario
Aurora over OntarioAurora over Ontario
Questions

Common questions about aurora in Ontario

Can you see the northern lights in Ontario?
Yes, during stronger storms. Northern Ontario sits at 55-57° geomagnetic latitude - the latitude measured from Earth's magnetic poles, which is what governs where aurora reaches - where Kp 3 is enough on clear nights from the highest-latitude dark sites such as Thunder Bay. Sudbury and Killarney at about 55° geomagnetic need Kp 5. Central and southern Ontario require similar storms: the Algonquin Park area needs Kp 5, and Toronto at about 54° geomagnetic needs Kp 5 or above. Because the geomagnetic pole sits over northern Canada, Ontario cities lie at a higher geomagnetic latitude than their map position suggests, so aurora reaches them more often than their map latitude implies.
What Kp is needed for aurora across Ontario?
It varies substantially with latitude. Thunder Bay at 57° geomagnetic needs Kp 3. Sudbury and Killarney at about 55° geomagnetic need Kp 5. The Muskoka cottage country around Torrance Barrens needs Kp 5. Algonquin Park needs Kp 5. Toronto at 54° geomagnetic needs Kp 5. Hamilton and Niagara at about 53° geomagnetic need Kp 5-6. The rule is roughly: every degree of geomagnetic latitude south raises the threshold. The farther north you can drive, the better your chances from southern Ontario.
What are the best dark sky sites in Ontario for aurora watching?
Torrance Barrens Dark Sky Reserve in Muskoka is the most accessible formally designated dark sky site for Toronto-area residents, about 2 hours north. Killarney Provincial Park on Georgian Bay gives excellent Bortle 2–3 sky 3 hours north of Toronto and is particularly strong as a northern Ontario destination. Algonquin Park is a practical compromise - 3 hours from Toronto with lake access and reasonable darkness. For the highest latitude and lowest Kp threshold, the Lake Superior shoreline near Thunder Bay and Sudbury are Ontario's premium aurora positions.
Can you see the northern lights from Toronto?
During strong geomagnetic storms, yes. Toronto at about 54° geomagnetic latitude needs Kp 5 as the minimum - G1 storms occur 20-30 times per year on average, so a handful of viable Toronto aurora nights happen each year. The best positions near the city are north-facing with dark horizons: Scarborough Bluffs faces east toward Lake Ontario (not ideal), while Rouge Beach at the northeast end of the lake gives a more open horizon. The key is to leave the city: Lake Simcoe 90 km north improves conditions considerably, and Torrance Barrens 165 km north is the practical dark sky answer.
How often does Ontario see aurora?
In far northern Ontario around Thunder Bay, aurora occurs on roughly 30-50 nights per year that have both clear skies and adequate geomagnetic activity - the current solar maximum (2024-2026) is producing more activity than any period in 20 years. The Kp 3 events that reach Thunder Bay number 40-60 per year during active solar cycles. Sudbury and central and southern Ontario (Toronto south) are more selective: Kp 5 events average 20-30 per year, but cloud cover on the Great Lakes means clear nights during those events are fewer. The practical answer is: dark skies and proximity to a lake north shore give the best odds.
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