That will leave 10 mostly southeastern counties-including Lehigh and Northampton-still in the red.
Wolf's decision puts Lebanon County in the second last cohort of counties to be moved to yellow.
At the same time, Seventeen PA counties that had already moved to yellow will move to green and includes Bradford, Cameron, Clarion, Clearfield, Crawford, Elk, Forest, Jefferson, Lawrence, McKean, Montour, Potter, Snyder, Sullivan, Tioga, Venango and Warren.
Any counties that remain red will move to yellow on June 5th, 2020.
The senators said the company has developed a comprehensive reopening plan to ensure the safety of its employees, and that it follows federal and state requirements regarding temperature and health checks, social distancing, mask requirements and hourly hand-washing.
That keeps the county's case count at 209 total.
As of Friday, the City of Brotherly Love had more than 17,000 confirmed cases of the virus and a death toll of almost 1,200.
Statewide there are now more than 66,000 positive cases reported and more than 312,000 negative tests.
The list of entertainers who have owned and played Martin guitars includes Elvis Presley, Paul McCartney, Eric Clapton, John Mayer and many others.
Two valley counties are indeed going green next Friday.
Despite those grim numbers, the message from Wolf was both that things are steadily improving and that they could have been much worse.
Gov. Wolf referred to a study by Drexel University that indicates that in Philadelphia alone, 60 days of staying at home resulted in more than 7,000 lives saved and prevented more than 68,000 people from needing hospitalization. While the 50 new cases per 100,000 population was considered, it did not weigh any more heavily than other factors.
He also cited New York Times data that shows Pennsylvania being one of just 19 states in which the number of new cases of coronavirus is now decreasing. Most other states are seeing their new case rate continue to increase or remain flat.