The trails are open daily, I believe 8 to 5 during the winter. The house is by tour only, however. The trails are beautiful and the whole place is wonderfully maintained. It is one of my favorite places to walk my dog.
No, you can visit during regular hours without a reservation. Please visit Ayr Mount's website for their schedule and hours: https://classicalamericanhomes.org/ayr-mount-hours-directions-map/ . Special events may require advance registration.
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