Dennis Knibbs, 88, was found late Thursday afternoon, Rocklin police said.
Knibbs went missing early Wednesday evening and into Thursday as the temperatures climbed steadily into the 90s.
Roughly 50 searchers, many of them volunteers, combed through a wide area of Rocklin through the day.
"Teams were split up and looking in our open space areas, parks, commercial areas, behind buildings," City of Rocklin spokesman Karen Garner said. "Anywhere we could think of where someone might be."
At about 5:45 p.m. Thursday, a volunteer with the Placer County Mountain Rescue Team found Knibbs a few hundred feet from a walking path in a thick, wooded area of a greenbelt. Achainsaw was used to help emergency workers reach him.
Knibbs had fallen earlier in the day and was lying down, out of view. He was was taken to the hospital to be checked, police said.
Residents on Osprey Court, next to the greenbelt, watched the search anxiously.
"Looked at social networking and saw that the gentleman was missing and we were thrilled that they found him and found him here," Mike Smith said.
Rocklin Police Chief Ron Lawrence thanked everyone who helped in the search, including the Placer County Sheriff's Department, the Placer County Mountain Search and Rescue Team and other volunteers.
"Placer County is an amazing place," Lawrence said.