California ARB website says that the access period is "three full years plus the partial year from when the decal was issued".
The program ends on September 30, 2025. Therefore, a decal issued after October 1, 2021 would be valid for three "full years plus the partial year from when the decal was issued", if the DMV transitioned to the new color on October 1, 2021 (the "three full years" would be October 1, 2022 through September 30, 2025 and the "partial year" would be issue date to September 30, 2022 although it wouldn't be a calendar year). Anyone want to take a guess on whether that will happen? I'll be watching closely, as if it does, I'll send out my application immediately instead of waiting until January 1, 2022.
The program ends on September 30, 2025. Therefore, a decal issued after October 1, 2021 would be valid for three "full years plus the partial year from when the decal was issued", if the DMV transitioned to the new color on October 1, 2021 (the "three full years" would be October 1, 2022 through September 30, 2025 and the "partial year" would be issue date to September 30, 2022 although it wouldn't be a calendar year). Anyone want to take a guess on whether that will happen? I'll be watching closely, as if it does, I'll send out my application immediately instead of waiting until January 1, 2022.