Generally — Most Areas
Swiss chard (zones 2-11) partially overlaps with Alaska (1a-7b). It can grow in zones 2-7 within the state.
Your yard isn't the whole zone.
Alaska spans zones 1a-7b, but your yard has its own microclimate — slope, trees, and low spots shift frost and sun across a single parcel. Enter your address and we'll score swiss chard against your land's actual soil, sun, and frost.
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Zone Comparison
Swiss Chard Needs
- USDA Zones: 2-11
- Soil pH: 5.5 - 7.5
- Sun: Full Sun
- Drainage: well (dry spells)
- Frost-Free Days: 160+
Alaska Has
- USDA Zones: 1a-7b
- Last Frost: May 1 - Jun 15
- First Frost: Aug 15 - Oct 1
- Annual Rainfall: 10-160 inches
- Common Soils: Permafrost, Glacial silt, Volcanic ash
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 Swiss Chard in Alaska
The frost window
Across Alaska, the last spring frost clears between May 1 and Jun 15, and the first fall frost lands between Aug 15 and Oct 1 (NOAA Climate Normals 1991-2020). Counting from the latest last frost to the earliest first frost, that's a 61-day window you can count on — up to 153 days on a mild site in a kind year.
Frost tenderness
Swiss Chard is frost-tender — its listed minimum temperature is 39.2°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 55 days to maturity (USDA PLANTS Database), one crop fits Alaska's 61-day dependable window with 6 days of margin — plant at the front of the window to keep that cushion.
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
Swiss Chard wants 160+ frost-free days; a typical Alaska site sees ~130 (NOAA Climate Normals). That leaves tight; use transplants and pick early-maturing cultivars.
Growing degree days
Swiss Chard needs ~700 GDD (base 50°F) to ripen. The state median runs ~2000 GDD (USDA NRCS county aggregates), so Alaska'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
Swiss Chard likes near-neutral soil (pH 5.5-7.5). That's the common-ground band across Alaska's permafrost and glacial silt — a soil test confirms it for your site. Drainage matters: this plant wants well (dry spells). If your Alaska 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. Alaska soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
Swiss Chard in Alaska — Quick Answer
- Verdict: Generally — Most Areas
- Plant Zones: 2-11 (USDA PLANTS Database)
- State Zones: 1a-7b (USDA ARS PHZM 2023)
- Growing Season: May 1 - Jun 15 to Aug 15 - Oct 1 (NOAA Climate Normals)
- Days to Maturity: 55 days
What Else to Consider
Zone compatibility tells you about winter cold survival — but Alaska growers also need to think about:
Extremely short growing season (70-110 frost-free days)
A high tunnel or greenhouse is standard Alaska practice — it turns 90 outdoor days into a real growing season.
Permafrost prevents deep root growth in many areas
Raised beds lift roots above the cold and warm weeks earlier in spring — the proven northern workaround.
Limited soil development in glacial terrain
Start with a soil test to see what glacial ground actually has, then build up with imported topsoil and steady compost.
Where in Alaska Fits Best
Even within Alaska's zones 1a-7b, county microclimates differ enough to change what thrives. These counties carry the closest zone match for swiss chard (USDA PHZM 2023):
Alaska Cooperative Extension
For Alaska-specific cultivar recommendations, planting calendars, and pest pressure for swiss chard, the canonical source is UAF Cooperative Extension Service. Their fact sheets carry the local trial data we can't generalize across 50 states.
Common Questions About Growing Swiss Chard in Alaska
When can I plant Swiss Chard in Alaska?
Alaska's last spring frost clears between May 1 and Jun 15, and the first fall frost lands between Aug 15 and Oct 1 (NOAA Climate Normals 1991-2020). Swiss Chard is frost-tender — its listed minimum temperature is 39.2°F (USDA PLANTS Database) — so wait until the last frost has cleared your specific site before planting out.
Can Swiss Chard mature before first frost in Alaska?
Yes — Swiss Chard matures in 55 days (USDA PLANTS Database), and Alaska's dependable frost-free window runs 61 days (NOAA Climate Normals 1991-2020), leaving 6 days of margin. Plant just after last frost and it ripens ahead of the first fall frost.
What hardiness zone is Swiss Chard grown in across Alaska?
Alaska spans USDA hardiness zones 1a-7b (USDA ARS PHZM 2023). Swiss Chard 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 Alaska site have?
A typical Alaska site sees ~130 frost-free days per year (derived from NOAA Climate Normals 1991-2020). Swiss Chard needs 160+ frost-free days, so check whether your local microclimate runs above or below the state average before settling on a planting date.
How should I amend the soil for Swiss Chard in Alaska?
Swiss Chard prefers pH 5.5-7.5 and well (dry spells) drainage (USDA PLANTS Database). That sits in the common-ground band across Alaska soils — a 30-minute soil test from a local Extension lab confirms it for your specific site.
Will Swiss Chard actually grow on my specific land in Alaska?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores swiss chard 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 Alaska
State-level data is a sketch. Your Growable Ground report scores swiss chard 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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