International Mountain Day at Radnor Lake

Celebrated on December 11th annually, International Mountain Day is an international observance day whose goal is to raise awareness about the role that mountainous regions play in the lives of people and their importance to our planet. On December 20th, 2002, the United Nations designated December 11 as International Mountain Day.

This year we celebrate our 4th International Mountain Day at Radnor Lake on Saturday, December 9th at 7:00am-10:30am.

“Thinking like a mountain” is the term coined by Aldo Leopold in his book A Sand County Almanac and our focus-inspiration as we host our fourth celebration of International Mountain Day at Radnor Lake State Natural Area.

This unique hike-volunteer-resource management focused effort will include a hike through our native grassland’s restoration areas in the Hall Farm to our southern boundary where will remove invasive-exotic plants for approximately one hour to help restore this area back to its natural state.

Then, we will conclude the day with a strenuous hike to the ridgetop to enjoy the scenic views of the natural area from the ridgetop as we hike back to the Walter Criley Visitor Center to conclude our 2023 International Mountain Day at Radnor Lake.

This unique 3 1/2-hour hiking-volunteer opportunity involves a strenuous hike that will be limited to 25 visitors, is for ages 14 and up with registration required to attend this hike. No pets allowed on this hike. Good hiking shoes are recommended for this volunteer day as this hike to and from our project area entails a 150 ft incline climb to and from our invasive-exotic plant removal area. Participants should plan on hiking (strenuous) a total of 4-5 miles during this ranger led event.

Special thank you to Friends of Radnor Lake for providing bottled water, Gatorade, weed wrenches and work gloves for our 2023 International Mountain Day.

To register, please go to: