Check in

[Michael-and-Tracey1]

If guest go past there check in time can I refuse to except them arriving  late 

[Ian-And-Anne-Marie0]

@Michael-and-Tracey1 

If it is past your check-in time and they missed it, then yes.

You can offer that they arrive the next day at some convenient time if they have made a multi-day booking, if not, then they will have nowhere to stay and that might reflect in any review they leave.