How early someone can enter the U.S. depends mostly on their immigration status. This is something that should be taken into consideration when requesting start dates for CUA-sponsored non-immigrant statuses.
Nonimmigrant Status … | …can enter U.S. ... |
B-1/B-2 Visitor | no earlier than the start date of their visitor visa |
F-1 student J-1 Exchange visitor |
up to 30 days before start date on Form DS-2019 |
H-1B Temporary Worker O-1 Temporary Worker TN - Professional under NAFTA |
up to 10 days before start date of approved petition |