Most years the grasshoppers are just there, a background hum you don’t think much about. Then comes a dry, warm June on the heels of a mild winter, and one morning you’re driving fence and the ditch bank looks like it’s boiling. By the time you can see them jump ahead of the pickup in waves, the cheap, easy window to knock them back has already closed.
Grasshoppers are one of the few range pests where scouting a few weeks early changes everything. The nymphs that hatch in late spring and early summer are small, clustered, and can’t fly. That’s exactly when they’re easiest and cheapest to control. Wait until they’ve grown wings and spread across the whole allotment and you’re chasing adults that eat more, move constantly, and shrug off a lot of what you throw at them.
Why June is the window
Rangeland grasshopper eggs sit in the top inch of soil through winter and hatch as the ground warms. A dry, early spring pushes that hatch along. The little ones don’t travel far at first—they stay near where they came out of the ground, often along field edges, south-facing slopes, road ditches, and the disturbed ground around old corrals and water gaps. That concentration is your advantage. A problem that will eventually cover a quarter section usually starts in strips and pockets you can walk to.
Left alone, those nymphs go through several molts over a few weeks and turn into adults right about the time your grass is trying to put on its summer growth. A heavy population competes directly with your cows for every pound of forage, and unlike a cow, a grasshopper doesn’t quit when the grass gets short—it moves to the next patch, including hay meadows and the green strip along a pivot.
How to actually count them
You don’t need anything fancy. The standard trick is to pick a spot on the ground about a foot and a half square—roughly the area inside a hula-hoop-sized circle—look at it from a few steps away, then walk up and count how many hoppers jump out of that spot. Do it eighteen times across a pasture and you’ve sampled a square yard total. Add up the count, and you’ve got a rough number per square yard.
The exact threshold where treatment pays for itself depends on your forage, your stocking, and what control costs that year, but the principle is simple: light scattered numbers along a ditch aren’t worth spraying, and a wall of nymphs building across open range is. Walk several parts of each pasture, because the density along a warm edge tells you nothing about the middle. Do this in the heat of the day when they’re active, not at first light when they’re cold and still.
Pay attention to what stage they’re in, too. If most of what you’re seeing is small, wingless nymphs, you’ve got time and options. If they’re already flying, you’ve mostly missed the cheap fix for this year and you’re into damage control.
What to do about it
The most cost-effective approach on rangeland usually treats the young nymphs before they spread, and treats the areas where they’re concentrated rather than blanketing whole pastures. A reduced-rate treatment applied in strips—covering ground but leaving untreated buffers between passes—takes advantage of the fact that hoppers move into the treated ground on their own. It uses less product and leaves some habitat for the predators and parasites that help hold populations down. This is the kind of program area weed and pest districts and extension offices help coordinate, and there’s a real reason to talk to your neighbors: grasshoppers don’t honor fence lines, and a coordinated effort across several ranches beats one person spraying one pasture while the source next door keeps feeding the problem.
Read the label on any product for grazing and haying restrictions before you turn a sprayer loose—some have waiting periods that matter if you’re planning to cut that ground or run pairs on it soon. And keep a realistic view of what weather does. A wet, cool stretch after hatch can knock populations back on its own through disease, and a hard, dry summer can make even a moderate hatch feel like a plague. Neither is something you control, which is all the more reason to have your own numbers from actual scouting instead of a guess.
The ranchers who get hurt worst by grasshoppers are almost always the ones who found out too late. Spend a few mornings in June with nothing but a notepad, and you’ll know whether this is a nothing year or the one where you needed to act three weeks ago.
