Zirbel (6-6 1/4, 304, 5.14) said he currently considers Miami (Fla.), Michigan and Ohio State as his top three schools.
"I made an effort to go out this summer and visit all three of them," Zirbel said. "I wanted to go out and see my top three schools and hear what they had to say."
Zirbel is in high demand with nearly 30 offers. Others who have offered include Minnesota, Kentucky, Louisville and Tennessee. His hometown of Murray is located in western Kentucky near the Tennessee border.
He was at Ohio State June 26 for the senior advanced camp.
"It was the first time I've ever been there," he said. "I liked what I saw. I liked the facilities. I liked working with (offensive coordinator/line coach Jim) Bollman. He did a great job. He is a good coach. I felt comfortable around him. That is important for me in terms of this decision.
"I liked it a lot there and it was a good experience overall. I also got to talk to Coach Tressel for a couple of minutes when we were out on the field."
Like other recruits, Zirbel said visiting Ohio Stadium was a highlight of the trip.
"It was pretty cool," he said. "I had seen pictures of it before but I had never been there. Now that they have closed the whole thing in it is pretty nice."
Regarding Miami, Zirbel said, "I like their overall football tradition. They have been really good here lately and they have some good guys coming back. I had never been down there before. I had heard how nice their campus was and I wanted to check it out. Coach Kehoe is also a good guy, too."
Zirbel said he has been a Michigan fan growing up. His impressions on his time in Ann Arbor: "I took a trip up there for their spring game. I wanted to go back for their camp and see how Coach Moeller is on the field. I liked him also."
When asked when he hopes to make a decision, Zirbel said, "I'm not sure. I have thought about maybe committing toward the end of my season. I'm thinking I still may take a couple official visits."
Zirbel said he has worked mostly at tackle, but has slid to guard at times as well.
"Most of the schools are recruiting me at tackle," he said. "Ohio State and Michigan have said I might start out at guard and move to tackle later on."
Zirbel admitted it is neat to be considered among the nation's best OL.
"It is pretty cool," he said. "At first, it was kind of overwhelming. I was like, `Why am I on the list?' But I think it's a thing where you go to some of these camps and sort yourself out."
Sure enough, Zirbel was an award winner at both Michigan and Miami.
Zirbel, who benches 365 pounds, holds a 3.2 GPA and scored a 19 on the ACT.