Mullvad does not offer a free trial period. However, they have unlimited 3-hour trial accounts, which can be used to test the service before committing to it. This lets you know how the service works and if it meets your needs without paying for it upfront.
In addition, Mullvad also offers a 30-day money-back guarantee for those who are unsatisfied with the service after purchasing it. This gives you a chance to try out the service risk-free and get your money back if they’re unsatisfied.