How do you know when to take the psat?

I took the PSAT as a freshman and a sopre in high school, both times in the Fall. You need to talk to your guidance counselor because their is always more than one time that you can take the PSAT. My school in California acutally offers the test twice, once in the Fall and again in the Spring. Talk to your guidance counselor, they will more than likely know the dates and times.