Stargazing near Calgary tonight

Waterton, Banff and Jasper preserves are all inside a road-trip radius.

Updated: · Tonight: Friday, August 14, 2026

Best dark-sky site near Calgary tonight

★ Best tonight

Glacier NP

Northern MT · Bortle 2 · 255 km away

Excellent 10h of clear sky (≤30% cloud) during tonight's astronomical night, mean cloud 0%.

Best clear window: Fri 5:00 p.m. – Sat 2:00 a.m. (10h, 0% mean cloud)

Moon: New moon · 2% illuminated

Open live forecast → Site guide

How we picked tonight's best site

Show ranking debug panel (4 candidates, 7-level tie-break)

Glacier NP Lost on verdictRank to Waterton Lakes (but earlier rule decided).

Site Verdict Window Win cloud Min cloud Mean cloud Bortle Distance
Waterton Lakes Fair (3) 2h 6% 2% 64% 2 222.1 km
★ Glacier NP Excellent (5) 10h 0% 0% 0% 2 254.9 km
Elk Island Excellent (5) 9h 1% 1% 1% 3 299.6 km
Cypress Hills Good (4) 5h 9% 4% 49% 2 320.1 km

★ = chosen by tie-break ladder. Lower cloud %, lower Bortle, lower distance = better. Higher windowHours = better.

Tie-break ladder (in order)

  1. verdictRank (desc) — Excellent > Good > Fair > Poor > No-go
  2. windowHours (desc) — Longer clear window wins
  3. windowMeanCloudPct (asc) — Cleaner sky inside the window
  4. tonightMinCloudPct (asc) — Best moment of the night
  5. tonightMeanCloudPct (asc) — Overall sky quality
  6. bortle (asc) — Darker site wins
  7. distanceKm (asc) — Closer wins last

Same metrics are exposed at snapshot.json as bestTonight.tieBreak and closestSites[].tieBreak.

Understand tonight's forecast for Calgary

Each verdict above blends four limiting factors. Tap a card to learn what it measures, where the number comes from, and how to use it.

📖 How to read the forecast Plain-English breakdown of every row, color and score. 🌙 Moon & tonight's window New moon · 2% illuminated ☁️ Cloud cover & sky score Mean cloud tonight: 0% (min 0%). 🔭 Transparency How clean the air column is — controls how faint a star you can see. 🔥 Smoke & AQI Wildfire smoke and PM2.5 from US-AQI — kills transparency before clouds do.

All 4 closest sites, ranked by distance

Waterton Lakes

Southern AB · Bortle 2 · 222 km away

Fair Short 2h window, otherwise mean cloud 64%. Worth a look if you're nearby.

Best clear window: Sat 1:00 a.m. – Sat 2:00 a.m. (2h, 6% mean cloud)

Moon: New moon · 2% illuminated

Open live forecast → Site guide

Glacier NP

Northern MT · Bortle 2 · 255 km away

Excellent 10h of clear sky (≤30% cloud) during tonight's astronomical night, mean cloud 0%.

Best clear window: Fri 5:00 p.m. – Sat 2:00 a.m. (10h, 0% mean cloud)

Moon: New moon · 2% illuminated

Open live forecast → Site guide

Elk Island

Beaver Hills, AB · Bortle 3 · 300 km away

Excellent 9h of clear sky (≤30% cloud) during tonight's astronomical night, mean cloud 1%.

Best clear window: Fri 6:00 p.m. – Sat 2:00 a.m. (9h, 1% mean cloud)

Moon: New moon · 2% illuminated

Open live forecast → Site guide

Cypress Hills

AB/SK border · Bortle 2 · 320 km away

Good 5h clear window during astronomical night, mean cloud 49%.

Best clear window: Fri 10:00 p.m. – Sat 2:00 a.m. (5h, 9% mean cloud)

Moon: New moon · 2% illuminated

Open live forecast → Site guide

Frequently asked questions

Where can I stargaze near Calgary tonight?

Tonight's best site near Calgary is Glacier NP (255 km away). Verdict: Excellent. 10h of clear sky (≤30% cloud) during tonight's astronomical night, mean cloud 0%.

What is the closest dark-sky site to Calgary?

Waterton Lakes is the closest, about 222 km from Calgary (Bortle 2).

Can I see the Milky Way from Calgary?

Calgary's urban sky is too light-polluted for naked-eye Milky Way. For a clear view of the galactic band, drive to a Bortle 1–3 site such as Waterton Lakes, Glacier NP, Elk Island, Cypress Hills.

When are northern lights visible near Calgary?

Aurora is visible during geomagnetic storms with Kp ≥ 5–6. Check the live aurora outlook and head to the closest dark site with a clean northern horizon.

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