Mowing Wet Grass: When to Wait and When to Go

Every homeowner article about wet grass says the same thing: wait. That is easy advice when you have one lawn and a free Saturday. On a route it costs a day you cannot get back, and the grass keeps growing while you wait for it.

So the useful question is not whether wet grass is worse to mow. It is. The question is which yards you can still cut today, and which ones you should leave alone.

What a wet cut costs you

Wet blades lie down instead of standing up, so the cut comes out uneven and the mower tears more than it slices. The clippings come off heavy and stick to each other. The University of Georgia's turf specialists put it simply: when a lot of clippings pile up on the lawn after mowing, they need to come off. That turns one pass into bagging or a second lap.

Wet weather also brings disease. UGA lists dollar spot and large patch showing up on warm-season lawns in a wet stretch, and brown patch on tall fescue. You cannot control the weather, but you can control the blade: Illinois Extension notes that a sharp blade cuts cleanly, and a clean cut is a smaller opening than a torn one.

Then there is the ground. UGA describes soil too wet to mow without leaving tracks or ruts. A bad cut grows out in a week. A rut is still there in August, and the customer sees it every time they look out the window.

The part the homeowner articles skip

Purdue's turf program says the thing the rest of them will not: it is better to mow when wet than to wait until the grass is dry and eight inches tall. That is the trade you are already making, and it comes with a technique.

Purdue's list, for when you are going anyway:

• Sharpen the blade before you head out. Wet grass punishes a dull one.
• Set the deck as high as it will go.
• Pull the mulching plug and side discharge instead.
• Throw the clippings onto the part you have already cut, so you can chop them again on the next pass.
• Double-mow, and break up the clumps left from last time.
• Bag it if that is what the yard needs.

Wet grass and wet ground are two different calls

Grass that is wet cuts badly. Ground that is soft takes ruts. The first one costs you a nicer looking lawn for a few days. The second one costs you the lawn, and sometimes the customer.

The catch is that the two do not line up. A sandy yard that took an inch overnight can be firm by lunch. A low yard on clay that took the same inch will still be soft on Thursday. Same storm, same street, different answer.

What LawnMow IT does with that

It measures rain per yard rather than per city, counted from the last time you cut that yard. Two customers four miles apart get different answers on the same afternoon, which in a summer storm they genuinely had.

A yard gets flagged as too soft when about an inch has fallen in the last three days, which is roughly where a mower starts leaving ruts instead of stripes. The other end matters too: under about a quarter inch in a week, the grass probably has not grown enough to be worth the trip. Both numbers are a starting point rather than turf science, and you can move them per account. There is more on how that works on the rain page.

Nothing moves on its own. You get the observation and a button. Tap it and it moves what can move, skips the yards on a longer cycle, leaves fixed days alone, and emails the customers affected. The judgement about the storm is yours. The arithmetic and the eleven emails are ours.

If you run a route where the wet season is also the growing season, why Florida rain makes your route harder covers why those weeks hit so hard.

The short version

Cut the yards that will not rut. Raise the deck, sharpen the blade, side discharge onto the mown side, and go back over the clumps.

Leave the soft ones for a day, and move them somewhere they fit rather than dropping them to the back of the week. Two weeks of growth is a different job and it should be priced like one.