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I never worry about frost, but do acknowledge when the ground is bound to be frozen...
You are south of CentroWisco and we're supposed to have major killing frost tomorrow, with a chance that the ground may start to freeze by the end of next week... I would plant seed tomorrow, but would irrigate nothing more than the first time , just to soak it in... if it warms after that, irrigation will be fine and may even cause seed to pop...
Overseeding in Oct is not uncommon for me over the years, and if it comes up 2 days before the ground freezes, it is always good to go... you will not likely get the germination that you'd get in August, but dormant seeding makes up the difference...
When do you typically get frozen turf???
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Water/air ratio in relation to water flow to/from any plantlife is a Basic Fundamental Concept in understanding seed germination as much as transplanting a 20' Maple tree in 90 degree weather...
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