Hello, we're a party of two French-Canadian climbers that would like to climb in Colorado Rockies in either late spring or early summer 2019 for a approximately a two weeks trip. However we had never climbed in US Rockies and would like to get some advices/tips on best suggested routes to ascent summits, and suggested time of year for best climbing. For alpine route, we're comfortable with Class 4 climbs (average 5.5-5.6 route on rock) and grade 4 ice climbing. We would like to avoid crowded period. Is there any good guide book for route description. thx for your input.

This book would be good for that time of year:

https://www.amazon.com/Colorado-Snow-Cl ... 0976052598