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Fall Fertilizer Timing for Northern Prairie Lawns (Zone 2)

Question: When to apply fall fertilizer in Zone 2? After grass stops growing and first frost, or before?

Nitrogen Source Matters

Nitrate nitrogen: quickly available in cold or warm soil—apply anytime. Apply ~30 days before first freeze. Ammoniacal nitrogen: only available in warm soil; below 45°F soil temp, pointless.

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