Long hike, LOVED doing it in March. I would assume that anytime between May-October this trail gets a lot of sun (on the upper half past the largest waterfall) and would require a lot of water to make it to the top. This hike can easily be made a 4 mile hike (the big waterfall is only 2 miles up the trail) but making it to the top gives great views and a GREAT booty workout. Wildflowers are awesome this time of year and the water from recent rains has the river overflowing with life. Highly recommend!