How long can you stay in Spain with a green card?

If you are a U.S. green card holder, you can stay in Spain as a tourist for up to 90 days within a 180-day period without needing a visa, as Spain is part of the Schengen Area. However, if you plan to stay longer or engage in activities such as work or study, you will need to apply for the appropriate visa. Always check for the latest travel regulations and requirements before your trip.