Tryout at D1?

Is he offering tryouts in the fall after students have already enrolled?

At most D1's, these tryouts almost never lead to roster spots.

Yes, after student already enrolls.

Check message I sent you

Swampboy knows my son's story from last year.  Steer clear of this situation. 

I witnessed one of these tryouts at my son's school.

It happened on the first official day of fall practice,

But it didn't happen until after the scrimmage game, which was open to the public, and included all the scholarship players and recruited walk-ons.  The players on the team had already worked out together for six weeks, participated in captain-led practices, participated in 4-on-1 coaching sessions, been issued team gear and assigned lockers, and had already bonded as the team.

Only after the team finished their scrimmage and left the field were the open tryout players permitted on the field.  The whole thing was completed in less than 45 minutes, including warmups. Infielders got to field a couple grounders. Pitchers threw about a half dozen pitches. Not much chance to show anything.  No one made the team. 

The rare player added from one of these always seems to be (1) someone with exceptional speed (who will only see the field as a pinch runner, if at all) or (2) a bullpen catcher (who never sees the field).

If an unrecruited player wants to keep playing for the fun of it in college, I'd recommend that they look into club baseball, first. It's a great outlet for a bunch of former high school players.

Thank you for that message. Wow....

I wonder where to find information/web links about Club Baseball Teams for college students?

This looks like a good place to start:  http://clubbaseball.org/Default.aspx

But it's probably wise to worry about school first and baseball second in this case.  

Also, I was talking to a dad whose kid was a really good HS basketball player. He had some interest from D2 and D3 schools but was clearly not a D1 prospect. He chose to attend a D1 school, where he's enjoying playing in a competitive fraternity league.

My youngest is a wrestler. He does not want to wrestle in college, although he had a few possibilities. 

One of his requirements for college is that they have a large inter mural program, so he can continue to compete in sports. I do not think he will try club baseball though, He has not swung a bat since he was a rising sophomore. 

The NCAA requires tryouts. It's mostly a farce at the D1 level given teams have probably over recruited in the first place. A kid from our high school was invited to attempt to walk on at a mid major. The head coach didn't attend. The assistants barely paid attention. The tryout ended after 45 minutes. The players were told there weren't any roster openings.  At a sometimes ranked D3 a friend's son told me 27 pitchers were invited to walk on for three roster spots. The coach only keeps 32 even though he could have an unlimited roster.

The NCAA rules do not require schools to offer tryouts.  They can do so if desired, but it's not a requirement.