Weed Control · Wyoming
How to Kill Creeping Charlie and Wild Violet in Wyoming
Creeping Charlie and wild violet shrug off standard three-way weed killer for two different reasons. Both answer to triclopyr — and to October, not spring.
Regional Hub
Wyoming Lawn Care
Lawn care built for Wyoming: Kentucky Bluegrass maintenance, regional weed and disease control, and a season-by-season calendar for USDA zones 4a–5b.
Dominant Grass
Kentucky Bluegrass
USDA Zones
4a–5b
Soil
Well-drained plains and rangeland soils (Forkwood loam, the state soil, is the representative one); shallow stony ground at elevation and alluvial soils along the river valleys
Humidity
Dry and relentlessly windy — Wyoming turf loses water to wind at a rate a humidity figure does not capture, and that is as true in January as in July
Weed Control in Wyoming
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Weed Control · Wyoming
How to Get Rid of Crabgrass: Timing Beats Chemicals in Wyoming
Crabgrass is a timing problem — but one pre-emergent pass is not a whole season. UF/IFAS: season-long control takes a second application 6–9 weeks later.
Weed Control · Wyoming
How to Get Rid of Nutsedge: One Pull Does Nothing in Wyoming
Nutsedge ignores ordinary weed killer because it is a sedge. UC IPM: one pull does nothing — but pulling every 2 to 3 weeks drains the tuber underneath it.
Weed Control · Wyoming
Kill Dandelions Without Killing Grass — For Good in Wyoming
Killing dandelions without killing grass comes down to the taproot: the selective herbicides that reach it, and the month they actually work.
Weed Control · Wyoming
Spring Weed Control: Soil Temp, Not the Calendar in Wyoming
Spring weed control is decided by soil temperature, not the calendar — a pre-emergent applied two weeks late does nothing at all. The trigger, and the plan.
Lawn Diseases in Wyoming
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Lawn Diseases · Wyoming
Voles in the Lawn: The Runways Fix Themselves in Wyoming
Melting snow reveals the runways, and the voles usually left with it. Illinois says the lawn regrows by summer — the damage worth acting on is on your trees.
Lawn Diseases · Wyoming
Lawn Disease After Flooding: What Follows the Water in Wyoming
Flooding moves the pathogen, stresses the plant and leaves the leaf wet. The hour thresholds that trigger Pythium and brown patch, and why nitrogen cuts both ways.
Lawn Diseases · Wyoming
Dollar Spot Treatment: The Disease Nitrogen Fixes in Wyoming
Dollar spot is the one lawn disease caused by too little nitrogen, not too much — the exception to every other fungus guide here. The hourglass lesion confirms it.
Lawn Diseases · Wyoming
Armyworms and Sod Webworms: Which Ate Your Lawn? in Wyoming
Green to brown in two days means armyworms; closely cropped patches mean sod webworms. Both are caterpillars — which rules out most grub products.
Lawn Diseases · Wyoming
Chinch Bugs: How to Confirm Them and What Kills Them in Wyoming
Chinch bugs: two species, two grass families, and a float test that confirms them in five minutes. Plus the documented resistance nobody prints on the bottle.
Lawn Diseases · Wyoming
Lawn Grubs: How and When to Kill Them in Wyoming
Most lawns never reach the grub treatment threshold, so count before you buy — and curative products only work from August through October.
Lawn Diseases · Wyoming
Brown Patch Treatment: Fungicide Alone Won't Fix It in Wyoming
Brown patch treatment needs two things: the right fungicide, and the summer nitrogen habit that caused it. Fungicide alone buys you a repeat next July.
Lawn Diseases · Wyoming
Snow Mold Treatment: It Grew Under the Snow in Wyoming
Snow mold treatment is mostly about the autumn before: gray and pink snow mold grew under the snow, so what you see in March is already finished damage.
Grass Types in Wyoming
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Grass Types · Wyoming
Buffalograss: Weeds Mean You Are Doing Too Much in Wyoming
Buffalograss lawn care inverts the usual advice: K-State says weeds are a sign it is overmanaged, so the fix is less water and later feeding, not herbicide.
Grass Types · Wyoming
Fine Fescue Lawn Care: The Grass That Wants Less in Wyoming
Penn State lists high nitrogen among the conditions fine fescue is not adapted to — beside heavy traffic. It is the one lawn grass you can spoil.
Grass Types · Wyoming
Perennial Ryegrass: The Fastest Grass, and Its Price in Wyoming
Penn State: it germinates in 5 to 7 days and is very competitive with other turfgrasses. Both halves decide what care this lawn costs you.
Grass Types · Wyoming
Kentucky Bluegrass Care: It Repairs Its Own Damage in Wyoming
Kentucky bluegrass repairs its own damage and browns in August for the same reason — rhizomes. Mow at 3 inches, feed in autumn, count the dormancy weeks.
Grass Types · Wyoming
Tall Fescue Lawn Care: Deep Roots, No Self-Repair in Wyoming
Tall fescue lawn care is one trade-off: the most heat-tolerant cool-season grass, but it never repairs itself and brown patch waits every summer.
Grass Types · Wyoming
Growing Grass in Shade: The Two-Hour Minimum in Wyoming
Growing grass in shade has a hard floor: fine fescue is the most shade-tolerant lawn grass and still needs two hours of direct sun. Below that, no seed works.
Fertilizer in Wyoming
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Fertilizer · Wyoming
Winterizer Fertilizer: Right Idea, Wrong Bag in Wyoming
Purdue backs late-fall nitrogen and faults the bags: rates run too low, the potassium needs a soil test to justify — and warm-season lawns should skip it entirely.
Fertilizer · Wyoming
Lawn Soil pH: When to Lime, When to Add Sulfur in Wyoming
Lawn soil pH decides whether lime or sulfur is the fix — and the right answer inverts between Georgia and Arizona. What the soil test number means.
Fertilizer · Wyoming
When to Weed and Feed: Two Bags Often Beat One in Wyoming
Weed and feed does two jobs on two different calendars, so one bag rarely times both right. The month it works, and the lawns the label forbids.
Fertilizer · Wyoming
When to Fertilize: Autumn Matters More Than Spring in Wyoming
When to fertilize a lawn: autumn matters more than spring for cool-season grass, the reverse for warm-season — plus the state laws that close the window.
Fertilizer · Wyoming
Why Is My Lawn Yellow? 9 Causes, Not Just Nitrogen in Wyoming
Your lawn is yellow and nitrogen is only one of nine causes — feeding the wrong one wastes a season. Diagnose by pattern, blade and timing first.
Lawn Care Guides in Wyoming
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Lawn Care Guides · Wyoming
Dormant Seeding: The Backup Window After You Missed Fall in Wyoming
Purdue's data: dormant seeding beats spring and trails September only slightly. The rule is cold enough not to germinate — Thanksgiving through March, not October.
Lawn Care Guides · Wyoming
Lawn Recovery After Flooding: The Clock Starts Underwater in Wyoming
How long turf survives underwater, why the damage shows up days later, the 1-inch silt rule, and the survival percentage at which replanting beats rescuing.
Lawn Care Guides · Wyoming
Lawn Ruts After Storm Cleanup: What Repairs, What Doesn't in Wyoming
Shallow ruts take a ¼-inch topdressing; deep subsoil compaction from heavy equipment on saturated ground is, in Penn State's words, practically permanent.
Lawn Care Guides · Wyoming
Waterlogged Lawn: Test It Before You Fix It in Wyoming
Water standing after every rain has four possible causes and they need different fixes. A 15-minute hole test tells you which one you have before you spend money.
Lawn Care Guides · Wyoming
When to Stop Mowing the Lawn: Watch 50°F, Not the Calendar in Wyoming
Cool-season grass stops growing when daytime highs stay below 50°F — that's the last-mow trigger. Too tall into winter invites disease; scalping is worse.
Lawn Care Guides · Wyoming
Winter Lawn Care: The Damage Happens in February in Wyoming
Penn State: crown hydration is the most common and destructive winter injury, and it happens in late winter after thawing and freezing — not in the deep cold.
Lawn Care Guides · Wyoming
Summer Lawn Care: What Helps and What Hurts in Wyoming
Summer lawn care inverts by grass type: feeding a warm-season lawn is routine; feeding a cool-season lawn is the classic mistake.
Lawn Care Guides · Wyoming
Fall Lawn Care: What to Do, and in What Order in Wyoming
Fall lawn care is the one season when doing more genuinely pays — for cool-season grass. On a warm-season lawn, autumn is mostly about stopping.
Lawn Care Guides · Wyoming
How to Aerate a Lawn: Spike Tools Make It Worse in Wyoming
How to aerate a lawn, and when not to: spike tools compact the soil they punch through, core aeration pulls plugs out, and most lawns need it rarely.
Lawn Care Guides · Wyoming
How to Fix Bare Spots in a Lawn — Or Leave Them in Wyoming
A bare spot smaller than your fist closes on its own. The bigger ones are a symptom — and the shape of the spot tells you which cause to fix first.
Lawn Care Guides · Wyoming
Lawn Mowing Height: Your Deck Setting Is Lying in Wyoming
Your deck setting is not your lawn mowing height — measure it once and most people find they cut lower than they think. The real number by species.
Lawn Care Guides · Wyoming
Should You Bag Grass Clippings? It Costs Nitrogen in Wyoming
Bagging grass clippings throws away up to a quarter of your lawn's nitrogen — and clippings do not cause thatch. The three times bagging is still right.
Lawn Care Guides · Wyoming
Spring Lawn Care: Do Less, and Do It Later in Wyoming
Most spring lawn damage is done in March by people being helpful. Spring lawn care runs on soil temperature, not the calendar — and the order matters.
Lawn Care Guides · Wyoming
When to Overseed Your Lawn — and When Not to Bother in Wyoming
When to overseed: late summer beats spring for cool-season lawns, most warm-season lawns should not be overseeded at all — and pre-emergent blocks your seed.
Lawn Care Guides · Wyoming
How Often to Water Your Lawn: Twice Beats Daily in Wyoming
How often to water a lawn: twice a week beats every morning, and one inch a week beats guessing. Measure your own sprinkler — the timer is not telling you.
Product Reviews in Wyoming
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Product Reviews · Wyoming
Best Weed Killer for Lawns: Match It to the Weed in Wyoming
There is no best weed killer for lawns, only the right one for your weed: the seven chemistries that matter, what each kills, and the one that kills grass too.
Product Reviews · Wyoming
Organic Weed Killer for Lawns: The One That Works in Wyoming
The organic weed killer that works on lawns is iron — it burns broadleaf weeds and moss in hours without harming grass. What it won't do: kill the roots.
Wyoming Lawn Calendar
What your Kentucky Bluegrass lawn needs, season by season.
Spring
- Assess winter desiccation first — in Wyoming that, not disease, is usually what the brown is
- Fertilize shortly after green-up with a quick-release product: soils are still cold and an organic one will not break down in time to matter
- Keep any single application under 1 pound of nitrogen per 1,000 sq ft
- Get the irrigation system running and audited before the first hot dry week, not after it
Summer
- Once soils have warmed, switch to slow-release or organic — one slow-release application covers most of the remaining season
- If the lawn is yellow, suspect iron before nitrogen: above pH 7.5 the iron is present and unavailable, and more nitrogen does not fix it
- When you do apply an iron product, sweep the excess off sidewalks and driveways into the grass before watering, or it stains
- Dig for billbug larvae before writing a thinning strip off as sprinkler coverage
Fall
- The most useful trick UW offers is to combine jobs: water the lawn, aerate or dethatch the next day, fertilize, then water again
- Seed late August into early September where the season allows
- Water late into autumn; turf going into a Wyoming winter dry is turf that comes out of it dead
- Take a soil test — and ask for the Olsen phosphorus method, which is the one calibrated for the calcareous soils of Wyoming and Montana
Winter
- Nothing goes down; the season is over
- This is the state where winter watering is not optional advice: on a mild day, with the surface thawed and the snow blown off, water
- Expect the damage to follow the wind — exposed south and west-facing ground loses its snow first and dries first
- Where snow does lie rather than blow, expect snow mould instead, and rake it open in spring rather than spraying at it
Official Wyoming resources
Three things every guide here eventually sends you to do — and all three answers are specific to Wyoming rather than national: test your soil, read your own land-grant programme, and check whether the state has added anything to a product's federal label.
Soil testing
There is no public university lab for homeowners here — the state points residents at private labs instead:
University of Wyoming Extension soil sampling and interpretation guidance, with laboratory referralsUW Extension publishes the sampling and interpretation material — including guides for gardens and landscapes — but does not point at a single destination laboratory, and the labs its educators refer people to include out-of-state university labs at Colorado State, the University of Idaho and Utah State alongside private ones. County Extension offices keep soil probes to lend. Ask for the OLSEN phosphorus method: it is the test calibrated for the calcareous soils of Wyoming and Montana, and a Bray result on this ground understates phosphorus.
Why the number matters more than the bag: soil pH in Wyoming.
Turfgrass research
Every guide here defers to your own land-grant programme somewhere. This is it:
University of Wyoming Extension — Barnyards & Backyards, lawns and soilsUniversity of Wyoming Extension
UW's home lawn fertilization guidance is worth reading against a national one precisely because it argues for less: one to two pounds of nitrogen a year for most Wyoming lawns, one to two applications, and for bluegrass or tall fescue a suggestion to consider fertilizing once every one to three years.
Where their advice and a national rule of thumb disagree, follow theirs — they trialled it in 4a–5b.
Pesticide regulation
Pesticide authority sits with the state department of agriculture:
Wyoming Department of AgricultureTechnical Services Division, Pesticide Program
The Division keeps a searchable listing of every private and commercial applicator in the state, so verifying a contractor's licence takes a minute rather than a phone call.
Restrictions we found printed on labels: Wyoming product restrictions.
Lawn Health Newsletter
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