Boise gets about 11.5 inches of precipitation a year and sits in USDA Zone 7a (6b in the foothills), yet most of the Treasure Valley is planted in Kentucky bluegrass. The City of Boise says 70% of its drinking water comes from limited groundwater, and most of the community uses that drinking water on lawns and landscaping (City of Boise). As of September 2026, no turf rebate is available in the Boise area. Nampa's $3-per-square-foot program is on hold for 2026. The Boise Foothills show what works here: sagebrush, bunchgrasses and wildflowers growing on rainfall alone.
Boise growing conditions
| Factor | Boise | Source |
|---|---|---|
| USDA hardiness zone (2023 map) | 7a in Boise, Meridian and the valley floor (83702, 83709, 83642); 6b in the East End and foothills (83716) | USDA |
| Annual precipitation | 11.51 inches, with 17.6 inches of average snowfall | NOAA 1991–2020 normals |
| Median last spring frost | April 24 | NOAA |
| Median first fall frost | October 21 | NOAA |
| Soils | River-bottom loam near the Boise River; thin, rocky ground on the bench and foothills; mostly alkaline | Local observation |
- Summers are dry. Most precipitation falls from late fall to spring. July and August are hot and nearly rainless, which is why lawns here drink so much.
- Real winters. Single-digit cold snaps happen. Choose plants hardy to at least zone 6 for exposed foothill lots.
- Wind on the bench. Low, fine-textured plants hold up better than big-leaved ornamentals.
- Low humidity helps. Silver-leaved steppe plants rarely get fungal problems here.
Look up your address with our Boise zone lookup.
Boise-area rebates (as of September 2026)
| Program | Amount | Cap | Key requirement | Link |
|---|---|---|---|---|
| City of Boise | No turf rebate offered | — | Free conservation tips and guidance | City of Boise |
| Veolia Water Idaho | No turf rebate found; free demonstration garden with 30+ water-wise plants | — | Open to the public | Veolia demo garden |
| Nampa in Bloom Waterwise Rebate | $3/sq ft of replaced turf (up to $2,500) + up to $2,500 for irrigation upgrades | $5,000 total | Replace at least 500 sq ft of turf; Nampa residents | On hold for 2026 |
We couldn't find a lawn-replacement rebate from the City of Boise or Veolia Water Idaho, Boise's main drinking-water supplier, for 2026. Nampa's program would pay $3 per square foot, but the city says it's "currently on hold for the 2026 season" and offers a waitlist in case it's renewed. If a Treasure Valley program opens, expect the usual rule from programs elsewhere in the West: get approval before you remove any grass. If your yard is watered by an irrigation district's pressurized system rather than city water, ask that district about conservation programs too.
The lack of a rebate doesn't change the math much. A conversion here pays back through lower summer water bills and much less mowing. The cost guide shows how to keep the project affordable without one.
Watering rules
The City of Boise says it "does not have any watering restrictions or related fines at this time." For the lawn you keep, it recommends watering "only 2-3 times per week for 40-50 minutes," in the coolest part of the day, and using drip for gardens (City of Boise). Established steppe plants need far less. Many need nothing beyond a deep soak every week or two in July and August.
HOA rules in Idaho
Idaho is different from its neighbors here. We found no provision in Idaho's Homeowner's Association Act (Idaho Code Title 55, Chapter 32) that stops an HOA from prohibiting xeriscape. Nevada and Utah both have such laws (Idaho Code). In many Treasure Valley subdivisions, your CC&Rs control what you can do. Read them, submit a plan with a plant list and drawing, and get written approval. A design that looks planted and cared for, with some green near the house, is much easier to get approved than a gravel yard.
The sagebrush-steppe plant palette
Shrubs: big sagebrush (the landscape's signature plant), rabbitbrush (gold in September), antelope bitterbrush, fernbush, serviceberry for spring flowers and berries, and Apache plume.
Perennials: penstemon (firecracker and Palmer's), sulphur buckwheat, Lewis blue flax (an Idaho native), yarrow, blanket flower, globe mallow, agastache and catmint. See drought-tolerant perennials.
Grasses: Idaho fescue (the state grass), bluebunch wheatgrass, blue grama and little bluestem. These bunchgrasses make a steppe planting look intentional (ornamental grasses guide).
Trees: netleaf hackberry, ponderosa pine, Gambel oak and pinyon pine on dry sites.
Visit Veolia's demonstration garden to see many of these plants at full size, and use University of Idaho Extension's horticulture resources for local growing advice.
Design notes: follow the foothills
- Copy the foothills' spacing. Widely spaced shrubs in a matrix of bunchgrasses and wildflowers, rather than solid beds, use the least water and look local.
- Use silver as the base color. Sagebrush, buckwheat and flax foliage carry the yard between bloom cycles. Use gold rabbitbrush and red penstemon as accents.
- Use local basalt. Dark basalt boulders and crushed gravel match the Snake River Plain better than imported river rock.
- Mulch with gravel in open areas. Crushed gravel matches the foothills and stays put in bench winds, while bark tends to blow away. Gravel vs. wood mulch compares the two.
- Keep green where you use it. A small irrigated lawn near the patio, surrounded by steppe planting, cuts water use substantially. Compare approaches in xeriscape vs. lawn.
- Plant south slopes with the toughest plants. On bench lots they're the hottest, driest spots (full-sun options).
From our installs: Sagebrush and bitterbrush dislike wet feet more than dry spells. The failures we see come from planting them in irrigated lawn soil or on a sprinkler zone. Give them their own drip line, water deeply through the first summer, then cut back sharply. By the third summer, a well-sited sagebrush planting in Boise can go most of July on stored soil moisture and one or two deep soaks.
Getting started
- Visit the foothills and the Veolia demonstration garden, and note which plants look good in late summer.
- Kill the lawn in fall by sheet mulching (methods compared), so the ground is ready in spring.
- Get HOA approval for your plan and plant list.
- Plant in September–early October or after the median last frost in late April, and put new beds on drip.
Hire it out
Browse the landscape pros listed for Boise and the Treasure Valley. Bid out the sod removal and drip conversion separately if you plan to do the planting yourself.
Neighboring guides: Salt Lake City, Bend and Reno.
Frequently asked questions
Does Boise have a lawn removal rebate?
Not as of September 2026. The City of Boise and Veolia Water Idaho don't list a turf-replacement rebate. Nearby Nampa's program ($3 per square foot, up to $2,500) is on hold for the 2026 season.
Does Boise have watering restrictions?
The City of Boise says it has no watering restrictions or related fines at this time. It recommends watering lawns only 2–3 times a week, 40–50 minutes per session, during the coolest part of the day.
What zone is Boise?
Most of Boise, Meridian and the valley floor are Zone 7a on the 2023 USDA map. The East End and foothills are 6b. The median last frost is around April 24.
Can my HOA stop me from xeriscaping in Idaho?
It may be able to. We found no Idaho statute protecting xeriscape from HOA rules, unlike Nevada, Utah and Colorado. Check your CC&Rs and get written approval before you remove your lawn.
What native plants grow well in Boise?
Big sagebrush, rabbitbrush, bitterbrush, fernbush, Idaho fescue, bluebunch wheatgrass, blue flax, penstemon and sulphur buckwheat all thrive on little more than Boise's natural precipitation once established.
