Conditional — Some Areas
amaranth (zones 2-11) has limited zone overlap with Minnesota (3a-4b). Only zones 3-4 in the state are suitable.
Your yard isn't the whole zone.
Amaranth is grown as an annual, so your winter zone isn't the deciding factor — your frost-free window is, and slope, trees, and low spots move the last-frost date across a single yard. Enter your address and we'll score amaranth against your parcel's actual frost dates, sun, and soil.
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Zone Comparison
Amaranth Needs
- USDA Zones: 2-11
- Soil pH: 4.3 - 8.5
- Sun: Full Sun
- Drainage: well (dry spells)
- Frost-Free Days: 30+
Minnesota Has
- USDA Zones: 3a-4b
- Last Frost: Apr 25 - May 30
- First Frost: Sep 10 - Oct 10
- Annual Rainfall: 19-34 inches
- Common Soils: Prairie loam, Clay, Sandy outwash
Plant Zone Range (zones 2-11)
Preferred Soil pH
Plant data: USDA PLANTS Database / plant_species_v5.csv. State data: USDA ARS PHZM 2023, NOAA Climate Normals, NRCS SSURGO.
When to Plant Amaranth in Minnesota
The frost window
Across Minnesota, the last spring frost clears between Apr 25 and May 30, and the first fall frost lands between Sep 10 and Oct 10 (NOAA Climate Normals 1991-2020). Counting from the latest last frost to the earliest first frost, that's a 103-day window you can count on — up to 168 days on a mild site in a kind year.
Frost tenderness
Amaranth is frost-tender — its listed minimum temperature is 44.6°F (USDA PLANTS Database) — so set plants out after the last frost has cleared your local site, not the state's earliest date.
Days to maturity vs. the window
At 90 days to maturity (USDA PLANTS Database), one crop fits Minnesota's 103-day dependable window with 13 days of margin — plant at the front of the window to keep that cushion.
Timing tuned to sub-state frost dates — Lake 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
Zone compatibility says you can survive winter here. Whether the growing season is long enough — and warm enough — is a different question.
Frost-free days
Amaranth wants 30+ frost-free days; a typical Minnesota site sees ~150 (NOAA Climate Normals). That leaves comfortable headroom for succession planting.
Growing degree days
Amaranth needs ~1200 GDD (base 50°F) to ripen. The state median runs ~2250 GDD (USDA NRCS county aggregates), so Minnesota's typical season clears that easily.
Climate aggregates derive from USDA NRCS county-level hardiness data + Cornell CALS Extension GDD-by-region tables + MSU Extension chill-hours-by-zone (1991-2020 NOAA Climate Normals baseline).
Soil + Drainage Fit
Amaranth likes near-neutral soil (pH 4.3-8.5). That's the common-ground band across Minnesota's prairie loam and clay — a soil test confirms it for your site. Drainage matters: this plant wants well (dry spells). If your Minnesota site is heavier clay or sits in a low spot, raised beds or amendment with compost solve it.
Your land, not the state average
Whether amaranth thrives in Minnesota comes down to drainage, and SSURGO drainage class flips from well-drained to poorly-drained parcel to parcel — your soil map unit, not the state average, is the real answer.
Check your parcel → Source: USDA NRCS SSURGO.
Plant pH and drainage requirements from USDA PLANTS Database. Minnesota soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
Amaranth in Minnesota — Quick Answer
- Verdict: Conditional — Some Areas
- Plant Zones: 2-11 (USDA PLANTS Database)
- State Zones: 3a-4b (USDA ARS PHZM 2023)
- Growing Season: Apr 25 - May 30 to Sep 10 - Oct 10 (NOAA Climate Normals)
- Days to Maturity: 90 days
What Else to Consider
Zone compatibility tells you about winter cold survival — but Minnesota growers also need to think about:
Extreme cold (zone 3a: -40F) limits many species
Plant to zone 3 realities and the garden thrives — the hardy-plant palette here is deeper than most catalogs suggest.
Short growing season (100-140 frost-free days)
Start transplants indoors and add a cold frame — the standard Minnesota moves that stretch a short season into a full one.
Heavy clay soils in the Red River Valley
Valley clay grows world-class crops once drainage is handled — raised beds do it instantly, compost does it permanently.
Growing amaranth here specifically
Amaranth roots run medium and prefer pH 4.3–8.5, but drainage comes first here: SSURGO maps about 34.6% of Minnesota as poorly or somewhat-poorly drained, and wet ground rots its roots before pH ever matters.
Plant amaranth on a raised, gravel-amended berm so water drains fast and the roots stays dry. How to handle it →
Timing shifts within Minnesota
Minnesota isn't one climate. In Lake County, the last hard freeze (28°F) holds until about May 3 — roughly 19 days later than the recorded state median — so plant amaranth to your county's window, not the statewide date.
County last-freeze dates: NOAA/PRISM Climate Normals 1991-2020, 28°F threshold (earlier than the folk 32°F "last frost"). A parcel report resolves your address's own frost dates.
Recommended Amaranth Varieties for Minnesota
Minnesota publishes no state variety trial for amaranth, so we won't invent a "best for Minnesota" list. Choose types rated to your USDA hardiness zone (3a-4b), and confirm winter survival and drainage against your own parcel.
Minnesota Cooperative Extension
For Minnesota-specific cultivar recommendations, planting calendars, and pest pressure for amaranth, the canonical source is University of Minnesota Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Amaranth native to Minnesota?
Yes — the USDA PLANTS Database (accessed 2026-07-01) documents Amaranth as native to Minnesota. Planting it supports the pollinators and wildlife that evolved alongside it.
Native-range data: USDA PLANTS Database state-distribution records, accessed 2026-07-01.
Common Questions About Growing Amaranth in Minnesota
When can I plant Amaranth in Minnesota?
Minnesota's last spring frost clears between Apr 25 and May 30, and the first fall frost lands between Sep 10 and Oct 10 (NOAA Climate Normals 1991-2020). Amaranth is frost-tender — its listed minimum temperature is 44.6°F (USDA PLANTS Database) — so wait until the last frost has cleared your specific site before planting out.
Can Amaranth mature before first frost in Minnesota?
Yes — Amaranth matures in 90 days (USDA PLANTS Database), and Minnesota's dependable frost-free window runs 103 days (NOAA Climate Normals 1991-2020), leaving 13 days of margin. Plant just after last frost and it ripens ahead of the first fall frost.
What hardiness zone is Amaranth grown in across Minnesota?
Minnesota spans USDA hardiness zones 3a-4b (USDA ARS PHZM 2023). Amaranth carries a range of zones 2-11, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical Minnesota site have?
A typical Minnesota site sees ~150 frost-free days per year (derived from NOAA Climate Normals 1991-2020). Amaranth needs 30+ 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 Lake, the freeze-free season runs shorter than the state average, so verify your own county's window.
Is Amaranth native to Minnesota?
Yes — the USDA PLANTS Database (accessed 2026-07-01) documents Amaranth as native to Minnesota. Planting it supports the pollinators and wildlife that evolved alongside it.
How should I amend the soil for Amaranth in Minnesota?
Amaranth prefers pH 4.3-8.5 and well (dry spells) drainage (USDA PLANTS Database). That sits in the common-ground band across Minnesota soils — a 30-minute soil test from a local Extension lab confirms it for your specific site.
Will Amaranth actually grow on my specific land in Minnesota?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores amaranth 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 Minnesota
State-level data is a sketch. Your Growable Ground report scores amaranth against your parcel's exact soil, sun, drainage, and frost data — not zone averages.
Three things about your exact spot that zone averages miss:
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
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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 →