Tricos, early morning. Over by 9:00AM, but a blast when you're still half-asleep and the air is cool and moist.
The above is a fairly standard imitation, the one below is Al's Trico, a wonderfully simple pattern that is very effective.
Evenings bring all kinds of falling bugs, and one of the best right now is the Isonychia spinner. It's a big meal and trout love 'em. This is my extended body deer body hair pattern.
And finally, a daytime into evening favorite, the Yellow Sally. This small, pale yellow stonefly hatches sporatically throughout the day and when they return to the choppy water sections of our streams to lay their eggs they draw trout up to them like a kid to candy.