A high-altitude oyamel fir forest sanctuary where millions of monarch butterflies cluster on tree branches each winter, reached by a roughly 45-90 minute uphill walk or horseback ride from the entrance.
Santuario Piedra Herrada protects a high-altitude oyamel fir forest in the mountains near Temascaltepec, one of the most visited of Mexico State's monarch butterfly sanctuaries during the winter migration season. From November through March, millions of monarch butterflies that have flown from Canada and the United States cluster on the oyamel branches in dense, hanging colonies, occasionally filling the air when temperatures warm enough to trigger flight. Visitors walk or ride horseback from the sanctuary entrance up a forested trail of roughly 45 to 90 minutes each way, gaining significant elevation before reaching the viewing area where guides point out the colony clusters and explain the migration's ecology. The best butterfly activity occurs on sunny mornings between about 11:00AM and 1:00PM, when the air has warmed enough for the insects to leave the branches and fly in large numbers -- overcast or cold days can mean the colonies stay clustered and less visible. A round trip including the uphill walk or ride takes two to three hours, and local guides, mandatory at the sanctuary, lead small groups to minimize disturbance to the colonies. The site draws heavy weekend crowds during peak January-February season, so a weekday visit within that window offers a calmer experience while still catching the colonies near their largest size.
Good to know
- Hours
- Daily approximately 9:00AM-6:00PM during monarch season (November-March)
- Best time
- Sunny mornings between 11:00AM and 1:00PM, when butterflies are most active in the warmest part of the day
Location
Ejido de la Mesa, Temascaltepec, Mexico State, Mexico
19.1494, -100.0522 View on map
Highlights
- Dense monarch butterfly colonies clustering in oyamel fir trees, November-March
- Guided uphill trail with optional horseback riding to the viewing area
- Peak flight activity on sunny mornings between 11:00AM and 1:00PM
- High-altitude fir forest ecosystem in the mountains near Valle de Bravo
- Small-group guided visits required to protect the colonies
Tips for visiting
- Visit on a sunny morning between 11:00AM and 1:00PM for the most active butterfly flight
- Wear layered clothing -- mornings are cold at altitude even on sunny days
- Horse rental is available for the uphill trail for an additional fee if walking isn't preferred
- A guide is mandatory and included in admission -- no need to arrange one separately
- Visit on a weekday within peak January-February season to avoid the heaviest weekend crowds
- Stay on marked trails and keep noise low to avoid disturbing the colonies
When to visit
Sunny mornings between 11:00AM and 1:00PM during peak season, January through March, bring the most active butterfly flight.
Accessibility
The trail to the viewing area is a steep, unpaved uphill path with no wheelchair access; horseback riding is available as an alternative to walking, though it still requires some physical ability to mount and ride.
Frequently asked questions
How long does a visit to Piedra Herrada take?
The round trip, including the uphill walk or horseback ride and time at the viewing area, takes about two to three hours.
Is it worth visiting with kids?
Yes -- the butterfly colonies are a memorable sight for children, though the uphill walk is demanding, and horseback riding is a good alternative for younger visitors.
Is photography allowed near the butterfly colonies?
Photography is allowed, but flash and close contact with the colonies are prohibited to avoid disturbing the butterflies.