LAWN CARE • BISMARCK, ND
Lawn Fertilization and Weed Control in Bismarck, ND
Bismarck Landscape handles lawn fertilizing and weed control for homes and businesses in Bismarck, Mandan and Lincoln. We follow NDSU Extension’s timing for North Dakota lawns: feed around Memorial Day and Labor Day, stop crabgrass in spring, and kill perennial weeds in fall.
Here’s what matters right now. The fall feeding window has closed: NDSU says to feed before September 15 and not past the end of September. But early fall is the best time of year to kill dandelions, creeping Charlie and clover. NDSU says to wait until after a frost, then spray on a stretch of days warmer than 60°F.
PRECISION FEEDING • TARGETED WEEDS
What Our Fertilization and Weed Control Includes
- Feedings on NDSU’s schedule, at about 1 pound of nitrogen per 1,000 square feet each time
- Slow-release fertilizer, so the lawn feeds over weeks instead of surging for a few days
- Crabgrass preventer in spring, skipped on any area that’s been seeded
- Fall broadleaf weed control for dandelions, creeping Charlie, clover and thistle
- Spot spraying instead of blanket spraying when a lawn only has a few weeds
- Soil test advice for lawns that stay yellow, with iron where it’s needed
- Separate visits for feeding and weeds, because their best timing doesn’t line up
NDSU TIMING • ONE YEAR AT A GLANCE
Bismarck Lawn Feeding and Weed Calendar
| When | What to do | Why |
|---|---|---|
| Mid-April to mid-May | Crabgrass preventer, about a week before soil hits 55°F at 4 inches | Stops crabgrass seed before it sprouts |
| Around Memorial Day | Feeding #1 | Earlier feeding pushes top growth at the cost of roots |
| Around the Fourth of July | Optional feeding #2 | NDSU says skip it if the lawn is drought stressed |
| Around Labor Day, before September 15 | The most important feeding | Builds roots going into winter |
| Mid to late September, into early October | Broadleaf weed control | Weeds pull the treatment down into their roots |
| October and later | No fertilizer | Grass isn’t growing enough to use it |
The feeding schedule comes from NDSU’s turfgrass soil test guide, which suggests feedings around Memorial Day, the Fourth of July and Labor Day. If you only feed once a year, make it the Labor Day feeding.
FERTILIZER MATH • SOIL-BASED DECISIONS
How Much Fertilizer Does a Bismarck Lawn Need?
NDSU recommends about 1 pound of actual nitrogen per 1,000 square feet per feeding, and up to 3 pounds a year across three feedings. For fall, NDSU horticulturists suggest a product that is about 50% slow-release nitrogen.
Figuring the Right Amount
The bag’s first number is the percent nitrogen. NDSU’s example: “Four pounds of a fertilizer with 25% nitrogen provides 1 pound of actual nitrogen.”
| Lawn size | Fertilizer needed at 25% nitrogen |
|---|---|
| 1,000 sq ft | About 4 pounds |
| 5,000 sq ft | About 20 pounds |
| 10,000 sq ft | About 40 pounds |
NDSU also says to spread it in two directions at right angles to each other, water it in, and sweep granules off the driveway and sidewalk. Leave your clippings on the lawn. They break down and give some nitrogen back.
Phosphorus, Potash and Winterizers
- Phosphorus (the middle number): NDSU says established lawns usually don’t need it unless a soil test shows they’re short.
- Potash (the last number): the right amount depends on a soil test.
- Winterizers: Even NDSU’s horticulturists don’t fully agree here. One recommends a winterizer around 25-0-10 at Labor Day. Another says “the jury is still out” on whether fall potassium helps up north, since these products were developed for southern grasses. Either way, the nitrogen at Labor Day is the part that counts.
WHY TIMING MATTERS • NO LATE FEEDING
Why We Don’t Fertilize in October
It’s tempting to throw down one more bag in October. In Bismarck, that’s usually money on the ground.
NDSU Extension says “fertilizing beyond the end of September is not recommended.” Research in Minnesota and Wisconsin found “October and November applications were wasteful,” because grass slows way down once temperatures drop below about 50°F. That unused nitrogen can wash into the soil and waterways. NDSU also warns October feeding can push growth instead of winter prep, which raises the risk of winterkill.
Late nitrogen under Bismarck’s long snow cover also makes gray snow mold worse. That’s why our last feeding of the year goes down around Labor Day.
DON’T GUESS • TEST THE SOIL
Yellow Lawn? Test Before You Feed
If your lawn stays yellow after feeding, more nitrogen won’t fix it. NDSU says the ideal soil pH for lawns is about 6.5, but North Dakota soils often run 8.5 to 9.0. At that level, grass can’t get the iron it needs and turns yellow. NDSU calls this iron chlorosis.
- Get a soil test first. NDSU says to take 7 to 10 cores from the top 4 to 6 inches of soil, leaving out the thatch, and mix them. The NDSU Soil Testing Lab accepts homeowner samples.
- Use iron if the test points that way. A fertilizer with about 3% to 5% iron is a common fix.
- Skip lime. It raises pH, and Bismarck soil is already high.
CONTROL WHAT GETS THROUGH • SEPARATE TREATMENTS
Weed Control That Works in Bismarck
The best weed control is still a thick lawn mowed at about 3 inches. Tall grass shades the soil so fewer weed seeds sprout. Spraying is for what gets through.
Crabgrass: Stop It Before It Sprouts
Crabgrass is a summer annual that comes back from seed every year. NDSU says to put down a preventer about a week before the soil reaches 55°F at a 4-inch depth, usually mid-April to mid-May in North Dakota. Most preventers also stop grass seed, so we don’t use them on areas that were just seeded or will be seeded soon. NDSU notes mesotrione is an exception that can go down at seeding time. If you’re overseeding, see our aeration and overseeding service.
Dandelions, Creeping Charlie, Clover and Thistle
These are perennials, so they come back from the same roots every year. Fall is when they send food down to their roots for winter, and a fall spray rides along with it.
| Weed | Active ingredients that work on it |
|---|---|
| Dandelion | 2,4-D, often mixed with MCPP and dicamba |
| Creeping Charlie (ground ivy) | Triclopyr, or topramezone |
| White clover | Triclopyr, clopyralid, dicamba or quinclorac |
| Canada thistle | Clopyralid |
These come from South Dakota State University Extension and NDSU. Creeping Charlie is stubborn. Iowa State Extension says it usually takes at least two applications.
Spraying Rules That Make the Difference
Most failed weed sprays come from bad timing, not bad products.
- After a frost, on warm days. NDSU says to wait until after a frost, then spray during a few days warmer than 60°F. Bismarck’s first frost usually comes around September 20 to 25, so late September and early October are prime time.
- Light frost is okay, hard freezes aren’t. SDSU says light frosts before or after spraying typically don’t hurt results, but several hard freezes damage the weeds too much for the spray to work.
- Don’t mow for 3 days before and after. NDSU says leaving the leaves on the weeds helps them take in the spray.
- Keep it dry for at least 6 hours after spraying, per NDSU.
- Water a day ahead if it’s been dry. SDSU says moist soil helps the product work.
- Watch the wind. Iowa State says don’t spray in winds over 5 mph, or when temperatures are headed above 85°F within 24 hours.
Why We Don’t Use Weed-and-Feed
NDSU advises against weed-and-feed. The best feeding days are late May and Labor Day, but the best weed days are mid-April to mid-May for crabgrass and mid to late September for dandelions. A combo product is always early or late for one of them.
KEEP TREE ROOTS SAFE
Protect Your Trees When Spraying Weeds
NDSU warns that “dicamba and triclopyr can be hard on trees, so do not spray trees or get the spray on any exposed roots.”
That matters more than usual in Bismarck right now. Many homeowners are paying to protect their ash trees from emerald ash borer, and planting young trees to replace the ones that come down. Don’t spray around the base of trees or over roots running near the surface. Near trees, we spot spray only. Read more about whether to treat or remove your ash tree.
CREDENTIALS BEFORE TREATMENTS
Is Your Lawn Applicator Certified?
In North Dakota, anyone who applies pesticides “to the land or property of another for hire” needs commercial certification. Weed killers count. NDSU Extension runs the program, and the category for lawns is Ornamental & Turf Pest Control. Certification has to be renewed every three years.
Before anyone sprays your lawn, ask to see their certification card.
PUBLISHED ESTIMATES • NOT OUR QUOTES
How Much Does Lawn Fertilization and Weed Control Cost?
We couldn’t find a published cost guide for lawn fertilizing in Bismarck itself, so here are national figures from Angi.
| Service | National estimate | Source date |
|---|---|---|
| Lawn fertilization, average per application | About $225 | September 23, 2026 |
| Lawn fertilization, typical range per application | About $77 to $395 | September 23, 2026 |
| Adding weed control to a feeding | About $50 to $150 | September 23, 2026 |
| Herbicide application, 1/4-acre yard | About $60 to $180 | August 4, 2026 |
Source: Angi’s lawn fertilization cost guide and Angi’s weed removal cost guide. These are market estimates, not quotes. The price depends on your lawn size, how many feedings you want and how many weeds there are. We give you a written price after we see the lawn. For our season plans, see pricing.
Questions
Lawn Fertilization and Weed Control FAQ
Answers about Bismarck feeding dates, weed timing, and soil tests.
Still have lawn questions?
Browse more lawn questions in our full lawn care FAQ.
When should I fertilize my lawn in Bismarck?
Around Memorial Day and around Labor Day, with an optional feeding around the Fourth of July. NDSU says the Labor Day feeding is the most important, and it should go down before September 15. Use about 1 pound of nitrogen per 1,000 square feet each time.
Is it too late to fertilize my lawn in North Dakota?
After the end of September, yes. NDSU says fertilizing beyond the end of September is not recommended, because the grass isn’t growing enough to use it. Late nitrogen can wash away and make snow mold worse. Wait until around Memorial Day.
When is the best time to spray dandelions in North Dakota?
Early fall, from mid to late September into early October. Dandelions send food to their roots in fall and pull the weed killer down with it. NDSU says to spray after a frost, during a few days warmer than 60°F.
Can I spray weeds after a frost?
Yes. NDSU actually suggests waiting until after a frost, then spraying on a few warm days above 60°F. Light frosts don’t usually hurt results, but several hard freezes damage the weeds too much for the spray to work.
How do I get rid of creeping Charlie?
Use a product with triclopyr in the fall, and plan on at least two applications. Iowa State Extension says creeping Charlie usually needs more than one treatment. Keep triclopyr off tree roots, since NDSU warns it can be hard on trees.
Why is my lawn still yellow after fertilizing?
Usually because Bismarck’s alkaline soil locks up iron, not because the lawn needs more nitrogen. NDSU says North Dakota soils often run pH 8.5 to 9.0. Get a soil test, then use a fertilizer with about 3% to 5% iron if the test points that way.
Bismarck Landscape
Get a Feeding and Weed Plan for Your Lawn
Want a lawn that’s thick and green without guessing at the bag instructions? We’ll look at your lawn, tell you what it needs and when, and put it on a schedule.
You can also see our other contact options, our full lawn care in Bismarck, or our FAQ.