We've had so many warm days in Denver (today there is a snow storm though.) Monday it was 70 and yesterday it was just a bit cooler. My grass is already greening up and a neighbor has a deep, dark lawn already.

Fertilizer in early spring makes the grass blades grow faster at the expense of the roots. Your grass will be growing fast enough anyway. Do you really want to cut grass two or three times a week? You should not cut off more than 1/3 of the blade at a cutting. If you have a cool season grass, most of the fertilizer should be applied in the fall. If you are itching to use something now, use Milorganite. That can be used most anytime without detriment.

Thanks for the advice, Becky. I was going to use alfalfa pellets to fertilize but I really don't want to mow that often this time of year. I'll wait till May to fertilize.

Doesn't organic take at least a month to start releasing nitrogen?

Organic fertilizer begins "releasing" nitrogen immediately in the form of protein being fed to microbes. What takes roughly 3 weeks is the soil food web processing where the microbes feed on other microbes and their waste products to eventually release a nitrogenous plant food. Similar to the way mammals, birds, reptiles, and fish excrete a nitrogenous plant food, there are microbes which do the same thing only it is more tuned in to the needs of the plants.

If you want to target a date where the fertilizer effect is seen, 3 weeks in the future is a pretty good date. Morph is fairly careful when he gives dates for applying organic (early May) versus chemical (Memorial Day) fertilizer. I'm less careful. I picked the federal holidays as application dates more because they are easy to remember. I took a couple years making notes about the yellowness of my grass in San Antonio. Those dates kept my grass green all season.

Got it, thank you. So if you want nitrogen late May, early May is the time to apply.