The lake is home to a variety of fish species including rainbow trout, brook trout, and tiger trout. Rainbow trout are the most prevalent and can be caught using a variety of methods such as fly fishing, spin casting, and trolling.
Aside from fishing, visitors can enjoy various activities such as hiking, camping, and wildlife viewing. The lake is also situated near several other popular fishing spots in the Uinta Mountains, including Mirror Lake and Trial Lake.
For successful fishing, it's recommended to use small lures or flies, and to fish near the edges of the lake where the water is cooler. Early morning and late afternoon are the best times to fish, and it's important to pay attention to weather conditions as fish are more active in cooler temperatures.
The best time to visit Mary's Lake for fishing is during the summer months of June through August when the lake is accessible and the weather is mild. The average temperature during this time of year is around 70-80°F during the day and drops to 40-50°F at night. It's important to note that the lake may be inaccessible during the winter months due to snow and ice.