Best Irrigation Systems for Montana Yards

1. Pop-up spray heads for small and irregular lawns

Spray heads throw a fixed fan of water a short distance and suit small lawns, narrow strips and curved beds. Colorado State University Extension notes they work best at 30 to 40 psi (misting means too much pressure) and apply water fast, 1 to 2.5 inches an hour. The catch: on Missoula clay or compacted soil, that rate can run off before it soaks in, so spray zones often need shorter, repeated cycles.

2. Rotor heads for larger lawns

Rotors turn a stream across the lawn and cover 30 to 90 feet. They apply water slowly, about a quarter to three-quarters of an inch an hour, and more evenly, which CSU notes is an advantage on clay and compacted ground. The catch: they need longer run times, and spray heads and rotors should never share a zone, because they apply water at very different rates.

3. Multi-stream rotary nozzles for slopes and slow soils

Stream rotor nozzles fit into spray bodies but apply water slowly, like a rotor. CSU recommends them for slopes, slow-absorbing soils and small lawns where runoff is a problem. The catch: expect run times of 40 to 50 minutes rather than 10.

4. Drip irrigation for beds, shrubs and trees

Drip emitters put water at the base of each plant with almost no evaporation or overspray, which makes them the right choice for shrub beds, perennials, foundation plantings and young trees. MSU Extension notes drip causes minimal surface wetting, which also means fewer weeds between plants. The catch: emitters clog if the system has no filter, and lines need to be checked each spring.

5. Micro-spray for dense beds

Small spray jets on drip tubing that wet a whole bed rather than individual plants. Useful for dense groundcover and annual beds where individual emitters would be impractical, and for the fast-drying strips along driveways and sidewalks that MSU singles out.

6. Soaker lines for trees

Mature trees need deep, slow water across the root zone, which lawn sprinklers do not deliver. The City of Missoula recommends soaker hoses for trees, and MSU Extension says soaker hoses can cut water use by 60 percent or more. A soaker ring or a dedicated drip zone around a valued tree is one of the cheapest ways to protect it through a dry August.

7. A weather-based smart controller

The single biggest efficiency upgrade. A WaterSense-labeled weather-based controller adjusts the schedule to local weather instead of running the same program all season. The EPA estimates replacing a standard clock timer with one saves an average home nearly 7,600 gallons a year. Most can be run from a phone.

8. Rain and soil moisture sensors

A rain sensor stops the system from running during or after a storm, and MSU Extension recommends one on every lawn sprinkler system. Soil moisture sensors go further, skipping watering when the ground is still wet; the EPA estimates WaterSense-labeled soil moisture controllers can save an average irrigated home more than 15,000 gallons a year.

9. Pressure-regulated spray bodies

Many homes have water pressure well above what spray heads are built for, which causes misting and uneven coverage. Spray bodies with built-in pressure regulation fix that head by head. The EPA estimates WaterSense-labeled models save a typical home with pressure of 60 psi or more nearly 5,600 gallons a year.

What backflow protection does Missoula require?

Missoula Water requires an approved backflow preventer on every underground irrigation system, installed, maintained and tested every year. For a single-family home, the default is a reduced-pressure (RP) assembly; a properly installed atmospheric or pressure vacuum breaker may be used only with Missoula Water's written approval, and any system that injects fertilizer or pesticide needs an RP. Missoula Water keeps a list of certified backflow testers. If you are outside city water, check with your own provider.

How should a Montana irrigation system be winterized?

With compressed air, every fall. Colorado State University Extension advises not relying on manual or automatic drain valves, and says systems with electric valves must be blown out. Air pressure should stay at or below 80 psi for rigid PVC and 50 psi for polyethylene, and air should never be blown through the backflow device itself, since that can melt its seals. Our winterization guide explains the steps, and our sprinkler blowout service will do it for you.

When should you water in Missoula?

Missoula Water has no watering restrictions, but it suggests watering between 6 and 11 a.m. or 5 and 10 p.m. from May through September, when less is lost to evaporation. MSU Extension notes that lawns watered in hot midday sun can lose as much as 30 percent of the water. Our watering windows guide covers scheduling.

If you are planning a new system or rebuilding an old one, our irrigation design and installation team can zone it properly from the start, and our irrigation cost guide explains what drives price. To compare installers, see our list of the best irrigation companies in Missoula.

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