The Lake Country resident, whose name has not been released, did not return from a one-day outing on Saturday.
His truck was found on a remote logging road in a densely forested area earlier this week, but there have been no other signs.
Vernon Search and Rescue spokesman Pete Wise says the man could be injured or huddled somewhere and unable to respond to rescuers.
On Tuesday, a Vernon SAR official said the search would likely continue for one more day before being reassessed.
In addition to teams from Kamloops, Kelowna and several other Okanagan communities, specialized trackers, three dog teams and an RCMP helicopter are assigned to the search. (CKIZ)