Postill Lake sits in the mountains above British Columbia's Okanagan Valley, accessible via a turnoff on Old Vernon Road between Kelowna and Vernon.

The lake is set within a forested wilderness landscape and is well known for rainbow trout fishing, drawing fly anglers in particular during spring and early summer.

The lake serves as the focal point for both Postill Lake Lodge, a private resort offering cottages, cabins, and campsites, and a separate provincial recreation site.

Surrounding terrain supports hiking, mountain biking, and access to several nearby backcountry lakes. Swimming and non-motorized boating are also popular on the lake itself.