Dear Chris: Climbing Hydrangea can a bit slow to establish in the yard and your plants may be reacting to changes in weather earlier than usual the first year. If you have buds for next year and the stems are healthy, you sould be fine. Be sure to water them late in the season before the soil freezes and depending on location, giving them some winter protection from sun and wind will help them through the first winter.
Sincerely, Richard Hentschel