When will Arizona's leaves change? Warm, dry weather could delay autumn's show

Arizona's autumn leaf colors may be muted this year due to warmer nights and ongoing drought conditions. Andrew Richardson, an ecosystem ecology professor, observes that drought-stressed trees exhibit pale foliage and sometimes drop leaves prematurely. He expects peak colors for aspens in the high country around October 20-25, similar to the past five years, but warns that weather conditions can drastically impact this timeline. Since 1970, Flagstaff has experienced an average low temperature increase of 2. 5 degrees, contributing to less vibrant and less predictable fall displays.

This phenomenon is part of a broader trend affecting ecosystems nationwide, as scientists note changes in seasonal timing due to climate change. The changes could disrupt the natural cycles that have governed forest ecosystems for millennia. Local residents and visitors may need to adjust their expectations for autumn experiences in a changing climate. As temperatures rise, understanding these shifts becomes crucial for both ecological health and cultural traditions.