In April you'll be on the edge of Spring/Winter in Ridgway. Depending on where around Ridgway, there could still be some snow, but most likely it will be gone by then. April high temps average at almost 60 (F), but lows are still below freezing. A good many migrants will be making their way through by then, with both broad-tailed and black-chinned hummingbirds coming mid-April, as well as numerous warbler species.
Early April is the best time in CO to watch the spring lekking of prairie chickens, although the only one you'll be within 100 miles of will be the Gunnison.
I live about 20 minutes from Ridgway, and know the area pretty well! Why don't you PM me, and I can send you some more detailed lists from past bird walks, tours, etc.