The thing you need to be mindful of during the warmer weather is the water temperature of the stream you're fishing. That's why it's always good practice to carry a thermometer.
If you're fishing spring fed creeks that keep the water running cool, you can fish for trout just as you would during the cooler months--provided the water temps stay cool enough.
My rule of thumb is that when the water gets to about 65 degrees or higher, I probably should not be fishing for trout or look for cooler waters. There's plenty of smallmouth action to get into at that point.
Here's a good article that's worth your time.
Trout and Water Temperature: How Hot is Too Hot? | Hatch Magazine - Fly Fishing, etc.