Jumbo Reservoir in Julesburg, Colorado is a popular fishing spot that is stocked regularly with several species of fish, including rainbow trout, walleye, catfish, and yellow perch. The reservoir offers several activities like camping, boating, and bird watching. Anglers can use bait or lures to catch fish, and it's best to fish early in the morning or late in the evening. The best time to visit Jumbo Reservoir is during the spring and fall when the temperatures are cooler, with average temperatures ranging from 50-70 degrees Fahrenheit.