How many times a year should I fertilize my yard?> When and what should I use each time? I live in Minnesota.
Depends on what type of grass you have. I live in Ohio and we have a turf type mixture of rye, fescue and kentucky blue. I would imagine you have somewhat the same mixture of "turf type" grasses.
I use a winterizer fertilizer in late October. In early spring around March or so, I use a crabgrass preventor type fertilizer.
Around June, I use a fertilizer that has a broadleaf week killer in it.
I always have beautiful grass year round.
Hope this helps!