Yes — Strong Match
sweet alyssum is grown as an annual, so season length decides it here, not a winter zone — and New Mexico's typical season runs ~209 frost-free days against the ~40 sweet alyssum needs.
Sweet Alyssum in New Mexico — the short answer
Sweet Alyssum in New Mexico: grown in zones 5–9, full sun, against a state median of ~209 frost-free days.
- Plant zones
- 5-9
- NC State Extension Gardener Plant Toolbox
- New Mexico zones
- 5a-9a
- USDA PHZM 2023
- Frost window
- Mar 31 - Apr 19 – Oct 22 - Nov 9
- NOAA RCC ACIS 1991-2020, 28°F
- Shortest county season
- 144 days
- NOAA Regional Climate Centers ACIS, 1991-2020, county 28°F killing freeze
- Days to maturity
- 55 days
- Growable Ground Plant Database
Plant data: Growable Ground Plant Database, compiled from FAO ECOCROP, USDA PLANTS and university Extension sources — per-field provenance varies and is published with the dataset.
Your yard isn't the whole zone.
New Mexico spans zones 5a-9a, 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 alyssum against your parcel's actual hardiness, soil, and sun.
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New Mexico is not one climate
A single New Mexico answer averages 33 counties whose growing seasons are 120 days apart — from 144 frost-free days in Catron County to 264 in Doña Ana County. Which end of that your land sits nearer changes what sweet alyssum can finish before the first hard freeze.
The middle half of 33 counties runs 186–221 days, with a median of 209 days — a 120-day span end to end.
Measured across 33 New Mexico counties. NOAA Regional Climate Centers ACIS, 1991-2020, county 28°F killing freeze. Quartiles are order statistics — every figure shown is a value a real county recorded, not an interpolation. Your own site sits somewhere inside this range; a parcel report resolves where.
Where in New Mexico Fits Best
Even within New Mexico's zones 5a-9a, county microclimates differ enough to change what thrives. These counties carry the closest zone match for sweet alyssum (USDA PHZM 2023):
Zone Comparison
Sweet Alyssum Needs
- USDA Zones: 5-9
- Frost-Free Days: 40+
- Sun: Full Sun
- Mature size: 6 in tallWe haven't confirmed this against a published source yet.
- Picking window: ~90 days of harvestWe haven't confirmed this against a published source yet.
- Drought tolerance: MediumWe haven't confirmed this against a published source yet.
New Mexico Has
- USDA Zones: 5a-9a
- Last Hard Freeze (28°F): Mar 31 - Apr 19
- First Hard Freeze (28°F): Oct 22 - Nov 9
- Annual Rainfall: 8-20 inches
- Common Soils: Sandy loam, Caliche, Adobe clay
Plant Zone Range (zones 5-9)
Preferred Soil pH
We haven't confirmed this against a published source yet.
Plant data: Growable Ground Plant Database, compiled from FAO ECOCROP, USDA PLANTS, and university Extension sources — per-field provenance varies and is published with the dataset. State data: USDA ARS PHZM 2023, NOAA Climate Normals, NRCS SSURGO.
When to Plant Sweet Alyssum in New Mexico
The frost window
Across New Mexico, the last spring hard freeze (28°F) clears between Mar 31 and Apr 19, and the first fall hard freeze lands between Oct 22 and Nov 9 (NOAA Regional Climate Centers ACIS, 1991-2020). Counting from the latest last freeze to the earliest first freeze, that's a 186-day window you can count on — up to 223 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.
When to start the seed
Those dates are when sweet alyssum goes out, not when it starts. It is sown under cover about 4 weeks ahead, so counting back from New Mexico's late-side last freeze of Apr 19 is what fixes your sowing date — and a yard that clears frost earlier than the state's late date starts earlier still.
Winter standing
New Mexico runs as cold as USDA zone 5, and no sourced winter-hardiness floor is on record for sweet alyssum, so this page does not state whether it overwinters here — and gives no fall establishment date on the strength of a guess. Whether sweet alyssum is a permanent planting or a replant-every-spring crop for you turns on your own zone within New Mexico; check its hardiness range against that before treating it as long-lived ground.
Frost window: NOAA Climate Normals 1991-2020. Plant timing fields: Growable Ground Plant Database — frost-free days from FAO ECOCROP, days to harvest from university Extension production guides, and growing-degree-day and chill-hour minimums that are compilation estimates rather than published figures. Your site's own frost dates can run earlier or later than the state range — a parcel report pins them down.
Growing Season Fit
Frost-free days
Sweet Alyssum wants 40+ frost-free days; a typical New Mexico site sees ~209 (NOAA Regional Climate Centers ACIS, 1991-2020). That leaves comfortable headroom for succession planting.
Growing degree days
Sweet Alyssum needs ~600 GDD (base 50°F) to ripen. We haven't confirmed this against a published source yet. The state median runs ~2899 GDD (from PRISM 1991-2020 climate normals), so New Mexico's typical season clears that easily.
GDD and chill-hour figures are computed from PRISM 1991-2020 monthly climate normals; frost-free days from NOAA Regional Climate Centers ACIS, 1991-2020. Each is the state median across its counties (P25/P75 span the within-state spread). Hardiness-zone range is USDA PHZM 2023.
Soil + Drainage Fit
Sweet Alyssum likes near-neutral soil (pH 6-7). That's the common-ground band across New Mexico's sandy loam and caliche — a soil test confirms it for your site. Drainage matters: this plant wants well (dry spells). If your New Mexico site is heavier clay or sits in a low spot, a raised bed lifts the roots above wet ground, or work in compost. pH range and drainage need: We haven't confirmed this against a published source yet.
Plant pH requirements: FAO ECOCROP and USDA PLANTS, with the remaining rows from other published sources or Growable Ground compilation. Drainage: FAO ECOCROP, with the remaining rows from other published sources or Growable Ground compilation. New Mexico soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
What Else to Consider for Sweet Alyssum in New Mexico
The zone range tells you where sweet alyssum is grown — but New Mexico growers also need to think about:
Very low rainfall requires irrigation for most crops
High altitude UV intensity can burn tender transplants
Alkaline soils limit plant selection without amendment
What to actually do about these — and the constraints that apply to every New Mexico grower, not just sweet alyssum — is covered on the New Mexico growing guide.
Timing shifts within New Mexico
Sweet Alyssum needs about 40 days of frost-free season to complete its cycle. Even Catron County — New Mexico’s shortest season at 144 frost-free days — clears that by 104 days, so season length isn’t the constraint anywhere in New Mexico. What varies is your own parcel.
Across New Mexico’s 33 counties the frost-free season runs from 144 days in Catron County to 264 days in Doña Ana County — a spread of 120 days, which is why a single statewide planting date misleads. The median New Mexico county sees 209 frost-free days, leaving sweet alyssum about 169 days of slack on a typical parcel — room for a second sowing where the season runs long.
County last-freeze dates and frost-free day counts: NOAA Regional Climate Centers ACIS (1991-2020), county 28°F freeze (earlier than the folk 32°F "last frost"). Sweet Alyssum's 40-day requirement: USDA PLANTS / Growable Ground plant database (minimum frost-free days). A parcel report resolves your address's own frost dates.
Pollinator + Wildlife Value
Sweet Alyssum draws honeybees, native bees, and butterflies (high value). Planting it near vegetable beds can lift fruit set on neighboring crops. Outdoors, sweet alyssum can only work that bloom inside New Mexico's frost window — roughly 209 days, opening after the last 28°F freeze (Mar 31 - Apr 19) and closing at the first (Oct 22 - Nov 9), per NOAA Regional Climate Centers ACIS, 1991-2020. Pollinator value: We haven't confirmed this against a published source yet.
New Mexico Cooperative Extension
For New Mexico-specific cultivar recommendations, planting calendars, and pest pressure for sweet alyssum, the canonical source is NMSU Cooperative Extension Service. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Sweet Alyssum native to New Mexico?
No — the USDA PLANTS Database lists Sweet Alyssum as introduced rather than native in the Lower 48, so it is not part of New Mexico's native flora. It grows here as a garden plant; pairing it with a few New Mexico natives keeps local pollinators fed too.
Looking for plants that belong here? The New Mexico growing guide lists plants that USDA PLANTS records growing in New Mexico and that Kew and NatureServe Explorer both list in its native range, leaving out any that NatureServe flags as exotic there or that our audit holds.
State records: USDA PLANTS Database state-distribution data (presence, not state-level nativity), accessed 2026-10-19.
Common Questions About Growing Sweet Alyssum in New Mexico
When can I plant Sweet Alyssum in New Mexico?
New Mexico's last spring hard freeze (28°F) clears between Mar 31 and Apr 19, and the first fall hard freeze lands between Oct 22 and Nov 9 (NOAA Regional Climate Centers ACIS, 1991-2020). No sourced winter-hardiness floor is on record for Sweet Alyssum, so this page does not state whether it overwinters in New Mexico 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 Alyssum grown in across New Mexico?
New Mexico spans USDA hardiness zones 5a-9a (USDA ARS PHZM 2023). Sweet Alyssum carries a range of zones 5-9, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical New Mexico site have?
A typical New Mexico site sees ~209 frost-free days per year (derived from NOAA Regional Climate Centers ACIS, 1991-2020). Sweet Alyssum needs 40+ frost-free days, so check whether your local microclimate runs above or below the state average before settling on a planting date.
Is Sweet Alyssum native to New Mexico?
No — the USDA PLANTS Database lists Sweet Alyssum as introduced rather than native in the Lower 48, so it is not part of New Mexico's native flora. It grows here as a garden plant; pairing it with a few New Mexico natives keeps local pollinators fed too.
How should I amend the soil for Sweet Alyssum in New Mexico?
Sweet Alyssum prefers pH 6-7 and well (dry spells) drainage. We haven't confirmed this against a published source yet. That sits in the common-ground band across New Mexico soils — a 30-minute soil test from a local Extension lab confirms it for your specific site.
Will Sweet Alyssum actually grow on my specific land in New Mexico?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores sweet alyssum against your address's mapped soil pH, drainage, sun, and frost-date data drawn from USDA SSURGO, NOAA, and PRISM — not state averages.
Check your specific parcel in New Mexico
State-level data is a sketch. Your Growable Ground report scores sweet alyssum against your land's mapped soil, modelled sun, drainage, and frost data — not zone averages.
Three things about your lot that New Mexico sweet alyssum averages can't show:
We read public map data around New Mexico — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the New Mexico sweet alyssum average
Explore More
Growing guides for sweet alyssum
Explore New Mexico county by county
New Mexico carries 33 counties with their own USDA zone — a sample of the growing pages for sweet alyssum there:
Where else sweet alyssum grows
Sweet Alyssum's zone band crosses state lines — these are the states closest to New Mexico in winter climate where it also has a page, plus the far ends of its range. Each one re-answers the question with that state's own record.
More to grow in New Mexico
New Mexico has a growing page for 1,033 plants — a rotating sample of the rest of the shelf.
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