Generally — Most Areas
sweet William (zones 3-9) suits most of Nevada (4a-10a) — zones 4-9 are in range, and the rest of the state is the exception.
Your yard isn't the whole zone.
Nevada spans zones 4a-10a, but your yard sits in exactly one — and slope, tree cover, and cold-air pockets nudge it further. Enter your address and we'll score sweet william against your parcel's actual hardiness, soil, and sun.
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Zone Comparison
Sweet William Needs
- USDA Zones: 3-9
- Sun: Full Sun
- Mature size: 1.5 ft tall
- Picking window: ~30 days of harvest
- Drought tolerance: Low
Nevada Has
- USDA Zones: 4a-10a
- Last Hard Freeze (28°F): Apr 28 - May 20
- First Hard Freeze (28°F): Oct 9 - Oct 21
- Annual Rainfall: 4-12 inches
- Common Soils: Desert sand, Caliche, Alkaline clay
Plant Zone Range (zones 3-9)
Preferred Soil pH
Plant data: USDA PLANTS Database / Growable Ground plant catalog. State data: USDA ARS PHZM 2023, NOAA Climate Normals, NRCS SSURGO.
When to Plant Sweet William in Nevada
The frost window
Across Nevada, the last spring hard freeze (28°F) clears between Apr 28 and May 20, and the first fall hard freeze lands between Oct 9 and Oct 21 (NOAA Regional Climate Centers ACIS, 1991-2020). Counting from the latest last freeze to the earliest first freeze, that's a 142-day window you can count on — up to 176 days on a mild site in a kind year. That marks the hard freeze, not the last light frost, so tender transplants usually wait another 2-3 weeks.
Winter standing
Nevada runs as cold as USDA zone 4, and no sourced winter-hardiness floor is on record for sweet william, so this page does not state whether it overwinters here — and gives no fall establishment date on the strength of a guess. Whether sweet william is a permanent planting or a replant-every-spring crop for you turns on your own zone within Nevada; check its hardiness range against that before treating it as long-lived ground.
Frost window: NOAA Climate Normals 1991-2020. Plant timing fields: USDA PLANTS Database. Your site's own frost dates can run earlier or later than the state range — a parcel report pins them down.
Soil + Drainage Fit
Sweet William likes near-neutral soil (pH 6.5-7.5). That's the common-ground band across Nevada's desert sand and caliche — a soil test confirms it for your site. Drainage matters: this plant wants well (dry spells). If your Nevada site is heavier clay or sits in a low spot, raised beds or amendment with compost solve it.
Plant pH and drainage requirements from USDA PLANTS Database. Nevada soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
Sweet William in Nevada — Quick Answer
- Verdict: Generally — Most Areas
- Plant Zones: 3-9 (USDA PLANTS Database)
- State Zones: 4a-10a (USDA ARS PHZM 2023)
- Growing Season: 28°F hard freezes about Apr 28 - May 20 to Oct 9 - Oct 21 (NOAA Regional Climate Centers ACIS, 1991-2020)
What Else to Consider for Sweet William in Nevada
Zone compatibility tells you about winter cold survival — but Nevada growers also need to think about:
Extremely low rainfall (driest US state)
Alkaline soils (pH 8-9) limit many species
Extreme summer heat in southern valleys
What to actually do about these — and the constraints that apply to every Nevada grower, not just sweet william — is covered on the Nevada growing guide.
Where in Nevada Sweet William Is Zone-Hardy
Sweet William is rated for USDA zones 3–9. Every one of Nevada’s 17 counties sits inside that band — from Elko County at zone 5a to Clark County at zone 9a — so winter cold is not what decides this plant anywhere in the state. What is left to vary is your own parcel: slope, shelter and cold-air drainage routinely move a site half a zone either way from the county figure.
Across those 17 counties Nevada’s winter-low ladder runs from zone 5a in Elko County to zone 9a in Clark County — 4 USDA zones of spread, which is 40°F between the two counties’ average coldest night of the year. That is why a statewide hardiness answer is where you start and not where you finish.
The planting window moves with it. Nye County holds its last hard freeze (28°F) until about May 31, while Clark County is clear by Jan 25 — 126 days apart. Set sweet william out on your county’s date, not the state’s.
County hardiness zones: USDA Plant Hardiness Zone Map (PHZM) 2023, per county. County last-freeze dates: NOAA Regional Climate Centers ACIS (1991-2020), county 28°F killing freeze — earlier than the folk 32°F "last frost". Sweet William’s zone 3–9 band: USDA PLANTS / Growable Ground plant database. A parcel report resolves your address’s own zone and frost dates rather than its county’s.
Where in Nevada Fits Best
Even within Nevada's zones 4a-10a, county microclimates differ enough to change what thrives. These counties carry the closest zone match for sweet william (USDA PHZM 2023):
Pollinator + Wildlife Value
Sweet William draws butterflies and moths (moderate value, Growable Ground Plant Database). Planting it near vegetable beds can lift fruit set on neighboring crops. Outdoors, sweet william can only work that bloom inside Nevada's frost window — roughly 163 days, opening after the last 28°F freeze (Apr 28 - May 20) and closing at the first (Oct 9 - Oct 21), per NOAA Regional Climate Centers ACIS, 1991-2020.
Nevada Cooperative Extension
For Nevada-specific cultivar recommendations, planting calendars, and pest pressure for sweet william, the canonical source is University of Nevada, Reno Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Sweet William native to Nevada?
No — the USDA PLANTS Database lists Sweet William as introduced rather than native in the Lower 48, so it is not part of Nevada's native flora. It grows here as a garden plant; pairing it with a few Nevada natives keeps local pollinators fed too.
Looking for plants that belong here? The Nevada growing guide lists USDA-documented natives for the state.
Native-range data: USDA PLANTS Database state-distribution records, accessed 2026-07-01.
Common Questions About Growing Sweet William in Nevada
When can I plant Sweet William in Nevada?
Nevada's last spring hard freeze (28°F) clears between Apr 28 and May 20, and the first fall hard freeze lands between Oct 9 and Oct 21 (NOAA Regional Climate Centers ACIS, 1991-2020). No sourced winter-hardiness floor is on record for Sweet William, so this page does not state whether it overwinters in Nevada and publishes no fall establishment date for it — check its hardiness range against your own zone before treating it as a permanent planting.
What hardiness zone is Sweet William grown in across Nevada?
Nevada spans USDA hardiness zones 4a-10a (USDA ARS PHZM 2023). Sweet William carries a range of zones 3-9, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical Nevada site have?
A typical Nevada site sees ~163 frost-free days per year (derived from NOAA Regional Climate Centers ACIS, 1991-2020). Sweet William should be matched against that window, so check whether your local microclimate runs above or below the state average before settling on a planting date.
Is Sweet William native to Nevada?
No — the USDA PLANTS Database lists Sweet William as introduced rather than native in the Lower 48, so it is not part of Nevada's native flora. It grows here as a garden plant; pairing it with a few Nevada natives keeps local pollinators fed too.
How should I amend the soil for Sweet William in Nevada?
Sweet William prefers pH 6.5-7.5 and well (dry spells) drainage (Growable Ground Plant Database). That sits in the common-ground band across Nevada soils — a 30-minute soil test from a local Extension lab confirms it for your specific site.
Will Sweet William actually grow on my specific land in Nevada?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores sweet william against your address's exact soil pH, drainage, sun, and frost-date data drawn from USDA SSURGO, NOAA, and PRISM — not state averages.
Check your specific parcel in Nevada
State-level data is a sketch. Your Growable Ground report scores sweet william against your parcel's exact soil, sun, drainage, and frost data — not zone averages.
Three things about your lot that Nevada sweet william averages can't show:
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