Yes — Strong Match
zinnia 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 ~60 zinnia needs.
Sow by about Aug 27
Zinnia is grown as an annual, so what decides it here is season length, not a winter zone. It needs about 60 frost-free days and a typical New Mexico season runs ~209 frost-free days, leaving 149 days of slack. That is room to sow as late as about Aug 27 and still finish before the usual first freeze (Oct 31), or to run a second succession.
Want more weeks at either end of that window? How to buy the weeks →
60 frost-free days required against New Mexico’s ~209-day season. NOAA Regional Climate Centers ACIS 1991-2020 (28°F killing freeze), state median across counties, via stateClimateData.ts.
Your yard isn't the whole zone.
Zinnia is grown as an annual, so your winter zone isn't the deciding factor — your frost-free window is. A typical New Mexico site runs ~209 frost-free days, but that is a state median, not your yard: slope, trees, and low spots move the last-frost date across a single parcel. Enter your address and we'll score zinnia against your land's actual frost dates, sun, and soil.
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Zone Comparison
Zinnia Needs
- USDA Zones: Data pending
- Frost-Free Days: 60+
- Sun: Full Sun
- Mature size: 3 ft tall
- Picking window: ~120 days of harvest
- Drought tolerance: Medium
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
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 Zinnia 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 zinnia 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.
Days to maturity vs. the window
At 65 days to maturity (USDA PLANTS Database), counting from the last hard freeze it ripens with 121 days to spare even in New Mexico's tightest freeze scenario — room for a later start or a second sowing.
Timing tuned to sub-state frost dates — Catron County, not the statewide average.
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.
Growing Season Fit
Frost-free days
Zinnia wants 60+ 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
Zinnia needs ~800 GDD (base 50°F) to ripen. 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
Zinnia likes near-neutral soil (pH 5.5-7.5). That's the common-ground band across New Mexico's sandy loam and caliche — a soil test confirms it for your site. It will grow across that whole span, but it does best between pH 6 and 7 — worth knowing before you decide whether a New Mexico soil test result is a problem or just a number. Drainage matters: this plant wants well (dry spells). If your New Mexico site is heavier clay or sits in a low spot, raised beds or amendment with compost solve it.
Your land, not the state average
New Mexico's soils run mostly loam, but SSURGO maps the series, texture, and drainage under your exact parcel. What matters for zinnia is the horizon its roots actually work, not the surface. That map unit, not the state average, decides how zinnia performs.
Check your parcel → Source: USDA NRCS SSURGO.
Plant pH and drainage requirements from USDA PLANTS Database. New Mexico soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
Zinnia in New Mexico — Quick Answer
- Verdict: Yes — Strong Match
- Plant Zones: Data pending (USDA PLANTS Database)
- State Zones: 5a-9a (USDA ARS PHZM 2023)
- Growing Season: 28°F hard freezes about Mar 31 - Apr 19 to Oct 22 - Nov 9 (NOAA Regional Climate Centers ACIS, 1991-2020)
- Days to Maturity: 65 days
What Else to Consider for Zinnia in New Mexico
Zone compatibility tells you about winter cold survival — 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
Growing zinnia here specifically
New Mexico's soils run mostly loam (Aridisols), and whether that suits zinnia's pH 5.5–7.5 preference comes down to your exact parcel, not the statewide picture.
Pull your parcel's SSURGO map unit, test pH, and amend toward zinnia's 5.5–7.5 target before planting. How to handle it →
What to actually do about these — and the constraints that apply to every New Mexico grower, not just zinnia — is covered on the New Mexico growing guide.
Timing shifts within New Mexico
New Mexico isn't one climate. In Catron County, the last hard freeze (28°F) holds until about May 22 — roughly 43 days later than the recorded state median — so plant zinnia to your county's window, not the statewide date.
Zinnia needs about 60 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 84 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 zinnia about 149 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"). Zinnia's 60-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
Zinnia draws honeybees, native bees, butterflies, and hummingbirds (high value, Growable Ground Plant Database). Planting it near vegetable beds can lift fruit set on neighboring crops. Outdoors, zinnia 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.
Recommended Zinnia Varieties for New Mexico
New Mexico publishes no state variety trial for zinnia, so we won't invent a "best for New Mexico" list. Choose types rated to your USDA hardiness zone (5a-9a), and confirm winter survival and drainage against your own parcel.
New Mexico Cooperative Extension
For New Mexico-specific cultivar recommendations, planting calendars, and pest pressure for zinnia, the canonical source is NMSU Cooperative Extension Service. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Zinnia native to New Mexico?
No — the USDA PLANTS Database lists Zinnia 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 USDA-documented natives for the state.
Native-range data: USDA PLANTS Database state-distribution records, accessed 2026-07-01.
Common Questions About Growing Zinnia in New Mexico
When can I plant Zinnia 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). Time outdoor planting to after the last hard freeze for your specific site — a further two to three weeks for anything tender — and count back from those dates for transplant scheduling.
Can Zinnia mature before first frost in New Mexico?
Yes — Zinnia matures in 65 days (USDA PLANTS Database), and New Mexico's dependable hard-freeze-free window runs 186 days (NOAA Regional Climate Centers ACIS, 1991-2020), leaving 121 days of margin. Plant once the last hard freeze has passed — two to three weeks later for anything tender — and it ripens ahead of the first fall freeze.
What hardiness zone is Zinnia grown in across New Mexico?
New Mexico spans USDA hardiness zones 5a-9a (USDA ARS PHZM 2023). Zinnia carries a range of zones Data pending, 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). Zinnia needs 60+ frost-free days, so check whether your local microclimate runs above or below the state average before settling on a planting date. In cooler counties like Catron, the freeze-free season runs shorter than the state average, so verify your own county's window.
Is Zinnia native to New Mexico?
No — the USDA PLANTS Database lists Zinnia 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 Zinnia in New Mexico?
Zinnia prefers pH 5.5-7.5 and well (dry spells) drainage (Growable Ground Plant Database). 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 Zinnia actually grow on my specific land in New Mexico?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores zinnia 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 New Mexico
State-level data is a sketch. Your Growable Ground report scores zinnia against your parcel's exact soil, sun, drainage, and frost data — not zone averages.
Three things about your lot that New Mexico zinnia 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 zinnia average
Analysis by the Growable Ground research team, grounded in USDA PLANTS, USDA NRCS SSURGO, NOAA Climate Normals (1991-2020), and named Cooperative Extension sources. How we know →
Cite this dataset
Kirchick, M. (2026). Growable Ground Plant Database [Data set]. Zenodo. https://doi.org/10.5281/zenodo.21435643
Licensed CC BY-NC 4.0. DOI 10.5281/zenodo.21435643
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