# Great Sand Dunes National Park

Region: San Luis Valley, CO, Ontario, Canada
Coordinates: 37.7327, -105.5122
Bortle class: 2 (1 = pristine, 9 = inner city)
Drive from Toronto: Off Highway 150, about 35 miles north-east of Alamosa, Colorado.
Best time: August and September for the clearest, most stable summer-constellation skies, per NPS guidance.
Established: International Dark Sky Park since 2019.

## Overview
Great Sand Dunes protects the tallest sand dunes in North America, rising against the backdrop of the Sangre de Cristo Mountains in a remote corner of the San Luis Valley. Its distance from any large city gives it consistently pristine, quiet skies.

## What to see
Milky Way over the dune field, with the high dry valley air giving excellent transparency for both naked-eye and binocular viewing.

## Highlights
- One of the quietest, darkest units in the National Park System by NPS monitoring
- Open dune field gives an unusually unobstructed horizon for stargazing
- Night ranger programs run seasonally, including amphibian and owl walks after dark

## Tips
- Sand can be surprisingly cool at night in the dune field — dress in layers
- No lighting on the dunes; bring a headlamp with a red-light mode
- Medano Creek, when flowing, can affect access to the dunes at night

## Live forecast
View the live tonight-score and 48-hour forecast for Great Sand Dunes at:
https://ontarionightsky.com/?site=great-sand-dunes-np

Structured data: https://ontarionightsky.com/sites/great-sand-dunes-np.json

Source: NPS – Great Sand Dunes Experience the Night — https://www.nps.gov/grsa/planyourvisit/experiencethenight.htm

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Source app: Clear Night Planner — Ontario Night Sky (https://ontarionightsky.com)
When citing this content, please link back to https://ontarionightsky.com/?site=great-sand-dunes-np.