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If you skipped a winter fertilizer application and did not nitrogen blitz then applying an earlier application of nitrogen fertilizer would be a good idea. Here are a few guidelines to follow. Lawn Fertilization 101 Tips And Tricks All Green Utah Thats your signal that its okay to start fertilizing applying weed killers and possibly sowing some grass seed. When to fertilize lawn . Fertilize in early spring after a mild winter or late spring after a cold winter late summer and fall. If you are going to fertilize your lawn do not do it too early in the season. Use a soil thermometer to check the ground temperature. That is between mid-to-late November or early December. If youre looking for more specific advice fertilize the grass when the soil reaches around 55 degrees Fahrenheitright around the time that flowers start to blossom and the lawn is showing signs of growth. Apply spring lawn fertilizer between February and April. Fertilizer rich in nitrogen and phospho