NJ Lawns Community

Hey everyone, I'm in Ridgewood and totally panicking! Just realized we're supposed to get our first frost Tuesday and I haven't mowed my lawn in almost 3 weeks. It's a tall fescue lawn, probably about 4 inches right now. Did I totally ruin it? Will the frost damage the long blades? I've read conflicting things online - some say you shouldn't mow before frost because it stresses the grass, but others say leaving it too long is worse. What should I do??? First time homeowner here and really stressed about losing all my grass.

Whoa Pumpkins, take a breath! You're not gonna kill your lawn, I've seen way worse. Here's the deal - you definitely DON'T want to mow right BEFORE a frost though. Wait til it's warmed up, so probably Wednesday or Thursday morning. Don't mow when there's any frost on the blades, that'll cause cell damage. If it's really long like 4 inches, I'd mow at highest setting this week and leave the clippings. Those cut ends will heal faster in warmer weather. What mower you running? I've got a Honda and love it for fescue.

Mike's mostly right but I'd add - the height matters more than you think going into winter. For tall fescue in our zone (6b-ish Bergen County), you want it around 2.5-3 inchesheading into dormancy. Anything over 3.5-4 inches and you'll get matting which breeds snow mold. NOT mowing is actually worse than mowing at the wrong time, but DON'T scalp it. Raise your deck to 3 inches and mow when dry. I'll tell you what I tell my commercial clients - a light fertilizing with potassium (winterizer blend) AFTER your last mow does more for frost hardiness than worrying about blade length. Pick up some Pennington Winterizer from the garden center in Paramus or Saddle River.

Everyone here's giving good info but I'm gonna push back on one thing - DON'T fertilize right now! It's late October, you don't want to push new growth right before frost anyway. That's how you get freeze damage. I've been maintaining lawns in Bergen County for 15 years and here's what I'd do: Wait til Wednesday after temps get above 50, mow at 3 inches, then just let it be. The tall fescue will go dormant naturally. Snow mold is only a real issue if you've got poor drainage or went into winter with a thatch problem. Honestly your bigger issue might be those maple trees dropping leaves - get em off the lawn before they mat! If you've got KBG mixed in that's more tender but honestly most blends around here handle zone 6 fine.

Reading all this and yeah I agree with the wait-to-mow timing but can we talk about leaving those clippings?! Please please don't bag them! That nitrogen is gold for soil health. Also - just my 2 cents but I've converted my whole yard to organics and honestly I've found fescue is way more forgiving than people think. My lawn looks way better since I started composting and use corn gluten meal in spring. Anywho not trying to start a war lol, just saying maybe don't stress so much! Frost actually helps break down thatch naturally. Good luck OP, let us know how it goes!