10/08/2026
If you're about to grab a "winterizer" bag this month, read the back before the front.
The front is marketing. The three numbers on the back are the whole story.
They're always in the same order: nitrogen, phosphorus, potassium, as a percentage of the bag's weight. Quick math: on a 50-pound bag, cut each number in half. A 24-0-12 bag has 12 pounds of nitrogen, zero phosphorus, and 6 pounds of potassium. See a 0 in the middle? That's on purpose. In Minnesota, it's illegal to put phosphorus on a lawn that doesn't need it, because it washes into lakes and feeds algae. Most metro soils already have plenty. The exceptions are a soil test that says you need it, or new seed. Winterizers are usually heavy on nitrogen and potassium. University of Minnesota Extension says the research is mixed on whether that extra potassium actually prevents winter damage. If your lawn isn't low on potassium, it may not do much.
So before you pay extra for the word "winterizer," check what's actually in the bag.