Don't forget that tree areas have a much cooler climate than open areas. There is plenty of snow in the woods at the higher elevations.
When you hike in the higher mountains, you find forests that are much cooler than open slopes at the same elevation (you can feel the sudden temperature difference as you pass from one to the other.)
The areas shaded by dense evergreens hide deep snow from easy view, and the snow there lasts well into the warm weather if there has been a lot during the winter. This past winter brought enormous snowfall dumps to NH elevations above 1500 feet. So even while the exposed slopes may be melting off quickly, the shaded areas will continue to produce snow melt through the spring.
The amount of contribution will gradually dwindle as the rapid-melt sources go bare and only the shaded slow-melt sources remain.
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