Richmond television stations showed Brown working Wednesday as police stood nearby. He wore an orange vest, white tank top, baggy jeans and red baseball cap and carried a yard tool to cut tall weeds.
Brown did not speak to the media but he waved to fans who saw him working.
The 20-year-old was sentenced in California last month to five years' probation, six months of community labor and a year of domestic violence counseling for the February attack.
He is performing the labor and undergoing counseling in Richmond, near his home in Montpelier.
A police spokeswoman would not discuss Brown's work.