>> Need something to lift your spirits? Read more uplifting news
In the post, Mayor Don Walters thanked Grimm, "for going above and beyond the call of duty," WJW reported.
Grimm is a six-year veteran of the fire department.
"It reminded me of my grandparents and my parents and what I would want somebody to do for them," Grimm told the Akron Beacon Journal. "I thought I might as well help these nice people out and finish up their lawn so he doesn't have to strain or anything like that for the rest of the day and worry about three or four strips unmowed and the neighbors looking at him funny."
Grimm said it took him five or 10 minutes to finish cutting the grass before he gathered the clippings, according to the newspaper.