While "best time" can be subjective, the most popular and generally favorable time to visit Navajo Dam is from late spring through early autumn, specifically May to October.During these months, the weather is consistently pleasant, with warm days and mild evenings, making it ideal for outdoor activities like fishing, boating, and hiking. The water levels of the San Juan River are typically good, providing excellent conditions for fly fishing, which is a major draw to the area.For those interested in fishing, particularly fly fishing, the period from June to September generally offers the most consistent conditions. The fish are active, and the river is at a comfortable temperature for wading. This period also coincides with longer daylight hours, allowing for extended time on the water.If you prefer to avoid the peak season crowds, May or October can be excellent alternatives.