The State of Hawai’i has emerged as a national and global leader on climate action, putting forth a 100% renewable energy by 2045 goal and target to reduce greenhouse gas (GHG) emissions to 1990 levels by 2020. However, Hawai’i also serves as a model for state-to-local coordination on these goals, with each of the four large counties bringing equal leadership to this multilevel collaboration. Beginning in 2018, the four city/counties–Hawai’i, Honolulu, Kaua’i and Maui–joined ICLEI USA through a unique statewide training cohort in order to: develop GHG inventories, begin forecasting reportable emissions data, and move into climate action planning in line with state goals.