Depending on the circumstances of your visa, you may be able to travel with a U.S. visa while it is in date and if you have the correct permissions relating to single or multiple entries.
If you hold a U.S. visa, the expiry date will be clearly stated. The time between the date it was issued and the date it expires is known as the validity of your visa.
You are permitted to come to a U.S. port with your visa and travel documents while your visa is valid. Holding a visa does not guarantee entry to the United States and you may be refused entry by immigration authorities.