Sunblock from last summer, will it still protect as much this summer

Well actually, sunblock has an expiration date like food. Usually if it's been hidden away on the porch or in a cabinet for a whole year then it may not be as good as it was wqhen you first bought it. Check the bottom of the bottle and you should see an expiration date. With some sunscreens a year might not make a huge difference, but then again it might. Just make sure to not get burned!!