Police are appealing for public assistance to help locate missing North Bendigo man Aaron.
The 28-year-old was last seen on the Harcourt Mountain Bike Track, Kalina Park, North Harcourt about 1.50pm.
Police and family have concerns for his welfare as he has autism and is non-verbal.
Aaron is described as having a thin build and brown hair and was wearing blue jeans, long sleeve maroon hoodie, bicycle helmet and was riding a black electric mountain bike.
Police have released an image of Aaron and urge anyone with information to contact Castlemaine Police Station on 5470 4100.