Kennon road is closed to traffic according to DPWH-Cordillera Administrative Region Regional Office's recent post at Facebook:

DPWH-CAR ROAD ADVISORY
DECEMBER 1, 218... - DPWH-Cordillera Administrative Region Regional Office | Facebook

The post also mentioned about an alternate route going to or coming from Baguio:

LIGHT VEHICLES bound to and from Baguio City are advised to take the alternate route, ASIN-NANGALISAN-SAN PASCUAL, TUBA BENGUET-TUBAO, LA UNION BOUNDARY ROAD
Anyone here tried this alternate route? How's the road and traffic condition compared to Marcos highway?