The County Weed & Pest Department is located at the Rio Blanco County Fairgrounds at 779 Sulfur Creek Road, Meeker, Colorado 81641. The phone number is (970) 878-9670.

The Weed Control Supervisor is Matt Scott, email:

Business hours vary during the year but they are usually:
Monday through Thursday from 7:00 AM / 5:30 PM, during the summer & Monday through Friday 7:00 AM / 3:30 PM during the winter.

The Rio Blanco County Weed & Pest Department will be selling Herbicide for weed control on Thursday mornings from 7 a.m. to noon in Meeker and delivering PRE-ORDERS to Rangely on Thursday afternoons. This schedule is effective from the first week in May through the first week of September. Other times can be setup by appointment.

During the summer we manage noxious weeds: along roadsides and county properties, special management areas and on private, state and federal lands.

Rio Blanco County Weed Management Plan
Rio Blanco County Development Department Weed Requirements , links to other county weed departments, laws & regulations and state weed distribution maps.
Labels and Material Safety Data Sheets for agriculture products

  • Control all noxious weeds on all County roads and properties to help protect our agricultural lands, wild and beautiful landscape and wildlife from the negative impacts noxious weeds.
  • Educate the general public and agencies on new noxious weeds that may be present in the county and surrounding areas.
  • Train all Weed Department Personnel to be as knowledgeable as possible in all aspects of weed management.
  • Assist as many landowners as possible in noxious weed control.
  • Continue to map all noxious weeds in the county according to state mapping standards and develop and implement short and long-term management plans.
  • Coordinate weed control activities with other county departments, adjoining counties, local governments and outside agencies.
  • Cooperate with research agencies in weed management research.
  • Assist landowners in developing management plans, calibration of spray equipment and identification of weed problems.
  • Provide Cost Share to landowners to ease financial burden of noxious weed control and give the best and most effective control recommendations.
  • Provide the general public with knowledge in the safe practices of weed management.
  • Provide Biological Control agents to assist in the control of large noxious weeds problems.
  • Provide current information on laws, labels, and county programs.
  • Provide informative newspaper articles on important perspectives of noxious weeds.
  • Encourage landowners with noxious weed problems to manage them properly.
  • Continue to educate myself in all aspects to be as beneficial to the county as I can be.


The Rio Blanco County Weed Department can assist you in calibration of your spraying equipment. Below are some formulations to assist you in calibrating different types or equipment.

If you have boom type sprayers please call the County Weed Department for further information.


Calibration of a backpack sprayer or a hand gun sprayer need not be intimidating. There is a simple formulation that can take the guesswork out of applying herbicides.

Many people frequently ask how much chemical do I need to add to my 4 gallon (or what ever size it may be) sprayer to control weeds. While I wish I had a magical formulation so I could just give you a rate to mix it at, it's not that simple. Some people will mist the plants, while others will try to drown the plants. Each chemical product will have a different rate of application. And many time's different plants will require different rates of application. So you see there is no magical formulation that can do it all. But there is a solution that is simple and quick.

To calibrate:
1. Measure an area 18.5 ft by 18.5 ft in the target area.
2. Spray the measured area with WATER ONLY and record the number of seconds required to cover the area uniformly while spraying constantly. (Do NOT stop spraying during step number 2)
3. Measure the amount of water delivered to the test area by spraying into a container for the same amount of time it took to cover the test area. Use an old measuring container and keep it for future calibrations.
4. The amount of water collected in fluid ounces equals spray volume in gallons per acre. Example if it took two minutes to cover the test area, spray into your measuring container for two minutes only. If you collect 30 ounces in that time period the amount of water needed to spray one acre would be 30 gallons.
5. Refer to the chart below for the amount of herbicide to mix at the spray volume indicated by the calibration procedure. This chart contains the amount of herbicide to mix when the application rate is 1 quart per acre. For a rate of 1/2 quart per acre (1 pint) divide the amount in the table by 2. For an application rate of 2 quarts per acre multiply the table value by 2, and so on.

To apply the equivalent of 1 quart of herbicide per acre at the spray volume indicated, mix according to the following chart:
Spray volume in
gallons per acre Amount of herbicide
per 1 gallon of water Amount of
herbicide per
100 gallons of water
20 10 tsp 5 quarts
40 4 & 3/4 tsp 2 & 1/2 quarts
60 3 & 1/4 tsp 1 & 2/3 quarts
80 2 & 1/3 tsp 1 & 1/4 quarts
100 2 tsp 1 quart

Remember the sprayer is now calibrated for your misting or drenching technique and anyone else using the sprayer should re-calibrated for their own technique. Always read and follow the entire product label when applying any pesticide.

3 teaspoons level (tsp) = 1 tablespoon level (tbs) & 2 tablespoons level = 1 oz.

Many speed odometers on tractors and trucks are not accurate at low speeds. To determine your correct speed use the following formula:
Stake off a distance of 88 feet in the area you are going to be treating.
Select the vehicle gear and throttle setting to be used.
Clock the seconds required to drive the 88 feet from a running start. Maintain a constant speed throughout the entire course. Drive the course at least 3 times and determine the average time in seconds it took you to travel the course.
Divide the time in seconds that it took to travel the course into 60; the answer is the miles per hour for those field conditions. Conditions can vary from field to field. Soft ground can slow your speed and hard ground can increase your speed.


Linear measurement:
5,280 feet = 1 mile

Measure of surface area:
144 square inches = 1 square foot
9 square foot = 1 square Yard
43,560 square foot = 1 acre

Liquid measure:
3 teaspoons (level) = 1 tablespoon or 1/2 ounce
2 tablespoons = 1 ounce
8 fluid ounces = 1 liquid cup or 16 tablespoons
2 cups = 1 pint
16 fluid ounces = 1 pint
2 pints = 1 quart
32 ounces = 1 quart
4 quarts = 1 gallon
128 ounces = 1 gallon

If you have any problems or a specific need your not sure about call the Rio Blanco County Weed Control Supervisor.


Rio Blanco County is available to provide herbicide application services for designated List A species and select List B species depending upon the species and where it occurs within the county.

The county may treat other noxious weed species if deemed that they pose a serious threat to the lands in Rio Blanco County. All noxious weeds are treated on a priority basis and as the counties work schedule allows. Herbicide costs are not included in any labor charges.

Application charges are as follows:

Contracts are charged $30 an hour for one truck, sprayer, fuel and one person. Charges start from the time we reach the property until the time we leave the property. A deposit for the estimated charges is required before we can proceed with any work.

Government agencies are charged $100 an hour for one truck, sprayer, fuel and one person. Charges start from the time we leave the shop in Meeker and end when we return back to the shop in Meeker. All government contracts require a purchase order number before we can proceed with any work.


The cost share program was established to encourage noxious weed management and reduce the financial burden on private landowners.

Rio Blanco County is able to offer a cost share for herbicides for the control of noxious weeds. Cost share funds are available on a first come first serve basis. For private landowners preparing a management plan, a 50% cost share rate is available up to a maximum of $500. For individuals purchasing herbicides without a management plan, a 25% cost share rate will be given, up to a maximum of $250. 2,4-D Amine and Low Vol formulations, non-selective herbicides (Glyphosate), adjuvents and dyes are excluded from the cost share program, but are available for purchase at low cost

Assistance in developing management plans can be obtained from the County Weed Department (970)878-9670 or CSU Extension (970)878-9490

Management Plans Check List:

1. Sketch a map of the weed project. Note: Does not need to be to scale or fancy, simple is usually the best. Trees, crops, roads, property lines, streams and ditches should be labeled. Map must include weed species and location and approximate acreage.

2. List Herbicide name(s), rates and timing for each noxious weed treatment, and other integrated methods that are part of your plan.

Turn in your Noxious Weed Management Plan to the Weed or Extension office for review or bring it with you when you receive your herbicide order.

The cost share program will provide financial assistance for noxious weed species only.

Cost share for herbicides are allowed as long as funds are available and only on a first come first serve basis and must be paid for when you pick up your herbicide. ONCE YOU PURCHASE ANY HERBICIDE FROM THE COUNTY YOU CAN NOT RETURN IT FOR REIMBURSEMENT, CREDIT OR EXCHANGE. Make sure the product you purchase is the product's you need and want. The County can provide you with a herbicide label so that you can read it and make sure that a certain herbicide product will suite your needs. Herbicides purchased through Rio Blanco County can only be used in Rio Blanco County.

To buy Restricted Use Products (RUP) you must have a current Colorado Department of Agriculture applicators license. Cost share funds are for private agricultural lands only. No government or commercial applicators can utilize cost share funds.

When you purchase herbicides from the county you assume all risk for your applications. Always read the entire herbicide label before purchasing, mixing, applying, disposing or storing any herbicide product. Remember the label is the law.


The Rio Blanco County Weed Department can assist you with herbicide recommendations for just about any weed problem you may have.

We can also help you to develop a sound Noxious Weed Management Plan to help you be successful in your reaching your weed management goals.

If you have a plant that you are concerned about you may bring that plant in for identification. You must bring in a fresh specimen that contains the entire root crown and above ground portion of the plant. The plant should be placed in a plastic bag with a few drops of water and kept in the refrigerator or a cool spot until you can bring it by the office. The specimen must be in good condition. If I am not in my office please put your name and phone number on the bag and leave it at my door and when I return I will get in back in touch with you.

Please call the office during normal business hours for any of the above needs.


The Rio Blanco County Weed Department can assist you in determining weather or not you have a noxious weed problem on your property. To schedule for an inspection call the county weed department to make arrangements. If noxious weeds are identified on your property we can help you to determine the best ways to manage the problem.

Saddle Light Sprayers

The White River National Forest Blanco Ranger District, White River Conservation District, and the County Weed & Pest Department have partnered to produce the "Saddle Light" horseback mounted sprayer. This unique design allows those small patches of weeds that are "off the beaten path" to be effectively managed. By utilizing four 5 gallon canisters this allows the applicator to carry 20 gallons of water and cover more ground as compared to a traditional 4 gallon backpack sprayer.

Pictures of the unit in action are below. For more information about price and availability please contact RBC Weed Control Supervisor Matt Scott at 970-878-9670 or