No power at outlets but breaker isn't tripped. What do I troubleshoot next?
Outside gfci's do go bad replace the one that won't reset with a weather resistant model it should have WR stamped on the face the electronics are coated so they last longer. While you are getting the new WR GFCI outlet pick up a extra heavy duty cover (sometimes called an in use cover) this will protect the outlet from the elements and the WR rating protects from fog and dew that wipes out the non rated gfci's over time.