The caves were formed approximately 50,000 to 100,000 years ago during the Wisconsin Glacial Stage.
The temperature inside the caves often remains 10 to 20 degrees Fahrenheit cooler than the surface temperature.
The site was discovered by trappers in the 19th century and officially opened as a commercial attraction in 1922.
Many of the caves are named based on their shape or perceived difficulty, such as 'The Lemon Squeeze' and 'The Devil’s Handiwork'.
The granite found at the site belongs to the Littleton Formation, dating back to the Devonian period.
The park is located near the site of the former Rumney village center.
Polar Caves Park features a series of interconnected glacial caves formed during the last Ice Age by the movement of the Laurentide Ice Sheet. The site offers self-guided tours through granite passages and rock formations that stay significantly cooler than the ambient air temperature. Visitors navigate a trail system that includes narrow squeezes, vertical climbs, and wooden walkways integrated into the geological site. The attraction is situated in the Baker River Valley of New Hampshire. It includes educational exhibits regarding regional geology and the history of the site, which opened to the public in 1922. The park grounds also feature a deer park and mineral sluice. Accessible pathways are available for parts of the park, though cave entry requires climbing through rugged terrain. The caves were created by the collapse of giant granite blocks during glacial recession.
The observation deck overlooking the entrance to the main cave system.
Wear sturdy, closed-toe footwear with good grip, as cave surfaces can be slippery and uneven.
Check the 'difficulty rating' signs posted before each cave entrance if you are claustrophobic or have limited mobility.
Bring a light jacket, as the cave temperatures remain low even on hot summer days.
Do not attempt the narrow 'squeezes' if you have back, neck, or claustrophobic concerns; there are always bypass trails for more difficult segments.
Operates seasonally, typically opening in late spring and closing in late autumn; subject to weather-related closures.
Closed-toe shoes are mandatory; avoid climbing on fragile rock formations; respect all posted safety warnings regarding narrow passages.
