Description

Lawn Seed Planner is a free planning site that helps homeowners read a grass-seed label, calculate how much material a treatment area needs, and work out how many bags to buy. Timing, soil-preparation and establishment guidance currently covers Minnesota. The site is a planning aid based on extension sources; it does not inspect or diagnose a property, choose a grass mixture, or promise results.

The seed-amount calculator asks you to measure only the area you intend to treat and to use the directions that match the job, such as overseeding, repairing bare ground or establishing a new lawn. It supports three clearly separated bases: a bag that covers a stated area, a packaged-product weight rate, and an explicit pure-live-seed, or PLS, rate. A packaged-product instruction is not divided by a purity percentage, and the PLS path is only for recommendations that are explicitly stated as PLS. The tool reports material to apply and then rounds bags up for purchase, without raising the application rate to use leftover seed. A worked example, labelled as invented teaching inputs, uses 2,500 square feet and a 7 lb bag that covers 1,750 square feet, which comes to 10 lb to apply and two bags to buy.

A Minnesota timing guide, checked 7 November 2026, follows University of Minnesota Extension in treating mid-August to mid-September as the preferred planning window for ordinary overseeding and renovation, with early spring as a second choice. Dormant seeding is treated as a different method, intended for seed to wait until spring, with Minnesota guidance cited for soil below 40°F and a usual timing of early November through mid-March. Those month names do not establish today's soil temperature in a particular yard. Related guides cover seed labels, site preparation, watering new seed and mowing after seeding.

The site links its sources and does not claim live weather, field tests, seed rankings or guaranteed results.