Drone Spraying in Ravalli County, Montana for Weeds, Pasture and Hay

Ravalli County drone spraying prices

Drone spraying in Ravalli County, Montana is quoted per acre for one pass, application only. Three out of four farms in the Bitterroot Valley are under 50 acres, and noxious weed control is the most common job. The rates below are set for irrigated hay ground, horse and cattle pasture, and knapweed-infested acreage on the valley benches.

Service	Typical rate	Notes
Pasture and hay herbicide	from $14/acre	Broadleaf passes on irrigated ground
Spotted knapweed program	from $16/acre	Rosette or bolting timing, spot or broadcast
Leafy spurge and new invaders	from $16/acre	Spot mode on mapped patches
Alfalfa weevil insecticide	from $14/acre	First crop and regrowth
Fall cheatgrass control	from $15/acre	Pre-emergent before germination

Product is billed separately, or the landowner supplies it. Montana drone rates run about $9–19 per acre, with $13 typical. Small or steep parcels usually cost more, because setup time is spread over fewer acres. The final price depends on water volume, slope, timber edges, ditches and power lines, and how many neighbors join one trip. The minimum charge is $300 per visit.

Bitterroot farms by the numbers

Measure	Ravalli County, MT (2022 Census)
Farms / land in farms	1,400 farms / 188,084 acres
Average farm size	134 acres
Farms under 50 acres	75%
Irrigated land	54,991 acres, 29% of farmland
Hay and forage	33,890 acres
Cattle / horses	19,015 / 3,333 head (horses 5th in Montana)
Nursery and sod / fruit and berries	2nd / 3rd in Montana by sales

Most land in Ravalli County is mountains: the Bitterroot National Forest covers roughly three-quarters of it. Farming squeezes into the narrow valley floor and benches, where development keeps splitting land into smaller acreages. Drone spray jobs here are often 5 to 40 acres, mostly hay, horse pasture and weed patches, with irrigation ditches and houses close by.

Montana's noxious weed law and the county weed district

Montana law makes it unlawful to let noxious weeds spread, and sellers must disclose them when land changes hands. The state list ranks weeds by priority:

• Priority 1A and 1B (eradicate or contain new arrivals): yellow starthistle, dyer's woad, medusahead, Scotch broom, rush skeletonweed, knotweed, blueweed.
• Priority 2A (control, limited spread): tansy ragwort, hawkweeds, tall buttercup, perennial pepperweed, yellowflag iris.
• Priority 2B (widespread, manage): spotted knapweed, leafy spurge, houndstongue, sulfur cinquefoil, Dalmatian toadflax, St. Johnswort, oxeye daisy, Canada thistle.

The Ravalli County Weed District in Victor runs a 50/50 landowner grant. It covers half of a project up to $500, and a licensed, insured commercial applicator counts toward the landowner's match. Spring work must be finished by June 30 and fall work by November 30. Hiring a drone operator for a mapped weed project fits that program.

Drone spraying knapweed and leafy spurge in Ravalli County

Spotted knapweed is the classic Bitterroot weed. Picloram works best at the rosette stage, and 2,4-D from bolting to early flower. MSU Extension notes that mowing at first flower, in mid-July to early August, helps a fall herbicide pass reach rosettes as they green up again. Leafy spurge is treated at spring flowering or on fall regrowth. Its deep roots mean the same patches need follow-up for several years.

Drones suit both weeds on Ravalli County ground. They fly the mapped patches, treat scattered plants on steep benches, and leave clean grass and nearby gardens alone.

Aminopyralid, hay and garden carryover

Aminopyralid products such as Milestone are widely used on Bitterroot hay and pasture. The residue passes through animals. A Corvallis gardener lost a vegetable garden to composted horse manure from hay treated three years earlier, with damage reported at about 10 parts per billion. Before an aminopyralid pass, tell the operator whether hay will be sold, or manure spread on gardens or compost. That may call for a different product, and the record should say what was used.

Alfalfa weevil on irrigated hay

MSU Extension's alfalfa weevil threshold is 20 larvae per sweep, or 1.5–2 per stem. Egg laying starts once days are regularly above 50°F. After first cutting, check under windrows: eight or more larvae per square foot means the regrowth needs protection. MSU also warns that pyrethroids can trigger aphid flare-ups. A drone treats irrigated hay without running tires across wheel lines or flood ditches.

Cheatgrass after wildfire

Cheatgrass is a regulated Priority 3 weed in Ravalli County. It's best treated in fall, before it germinates. In September 2023, the Forest Service and the Weed District helicopter-sprayed 3,000 acres of cheatgrass and knapweed above Sleeping Child, Gird Creek and Tolan Ridge, part of grant work planned at about 35,000 acres over four years. Private benches next to those slopes benefit from the same fall pre-emergent timing. A drone can treat them where a helicopter job would be too small.

Ditches, the Bitterroot River and Lee Metcalf refuge

The Bitterroot River runs north from the forks near Conner to the Clark Fork at Missoula, and native bull trout use the river and its tributaries. Irrigation water moves through big canal systems:

• the Bitter Root Irrigation District's "Big Ditch," 72 miles long and about 17,000 irrigated acres, fed from Lake Como;
• the Daly Ditches, 6,108 acres and 778 users, diverting north of Darby;
• hundreds of laterals and private ditches.

Lee Metcalf National Wildlife Refuge protects about 2,800 acres of floodplain north of Stevensville. Operators map ditches, wetlands and the refuge boundary as no-spray edges, and choose products labeled for use near water when ditch banks are the target. Beekeepers must register apiaries with the state by April 1, and operators check registered yards before spraying blooming fields.

Hamilton and Stevensville airports

Ravalli County Airport sits about 1 nautical mile east of downtown Hamilton, with a 5,200-foot runway. Stevensville Airport has a 3,800-foot runway northeast of town, and private strips dot the north valley. Wildfire season brings low-flying helicopters and temporary flight restrictions. Operators check FAA notices daily from July through September, and drones stay out of any active fire area.

Montana licensing for drone applicators

The Montana Department of Agriculture licenses commercial applicators. For-hire drone operators need:

1. a commercial license with classification 18, Aerial, plus the use classifications for their work. The fee is $85 a year, and licenses expire December 31;
2. $50,000 in liability insurance for aerial applicators;
3. application records kept for two years;
4. FAA Part 107 and Part 137 certificates, and a Section 44807 exemption for drones over 55 pounds.