HollyFrontier Corporation Second Quarter 2017 Earnings Release and Conference Webcast

DALLAS–(BUSINESS WIRE)–HollyFrontier Corporation (NYSE: HFC) (the “Company”) plans to announce
results for its quarter ended June 30, 2017 on August 2, 2017, before
the opening of trading on the NYSE. The Company has scheduled a webcast
conference on August 2, 2017 at 8:30 a.m. Eastern time to discuss
financial results.

This webcast may be accessed at:
https://event.webcasts.com/starthere.jsp?ei=1154338&tp_key=25e3e5850f

An audio archive of this webcast will be available using the above noted
link through August 16, 2017.

About HollyFrontier Corporation:

HollyFrontier Corporation, headquartered in Dallas, Texas, is an
independent petroleum refiner and marketer that produces high value
light products such as gasoline, diesel fuel, jet fuel and other
specialty products. HollyFrontier operates through its subsidiaries a
135,000 barrels per stream day (“bpsd”) refinery located in El Dorado,
Kansas, a 125,000 bpsd refinery in Tulsa, Oklahoma, a 100,000 bpsd
refinery located in Artesia, New Mexico, a 52,000 bpsd refinery located
in Cheyenne, Wyoming and a 45,000 bpsd refinery in Woods Cross, Utah.
HollyFrontier markets its refined products principally in the Southwest
U.S., the Rocky Mountains extending into the Pacific Northwest and in
other neighboring Plains states. In addition, HollyFrontier, through its
subsidiary, owns Petro-Canada Lubricants Inc., whose Mississauga,
Ontario facility produces 15,600 barrels per day of base oils and other
specialized lubricant products, and owns a 36% interest (including a 2%
general partner interest) in Holly Energy Partners, L.P.

Contacts

HollyFrontier Corporation
Craig Biery, 214-954-6510
Director,
Investor Relations