When to plant swiss chard in Seattle

Where are you growing?

Comfortable

Comfortable in greenhouse

Tight fit in a cold frame

Swiss chard in Seattle is a good fit outdoors. The suitable growing window of 273 days covers the 55–65 days this plant usually needs.

When to plantMarch 5 – July 18

Harvest: April 29 – September 21
Season vs crop: 273 grow days vs 55–65 needed
Typical frost (last spring – first fall): April 2 – October 25

Swiss chard in Seattle is a good fit outdoors. The suitable growing window of 273 days covers the 55–65 days this plant usually needs.

Planting conditions

Direct sow
Harvest

Local activity windows for this place and growing method. Blue fill is usually too cold for this plant. Dashed lines are typical last and first frost.

Suitable growing days in a row273

Days to harvest55–65 days from seed

Mar 5 – Jul 18

Direct sow

Apr 29 – Sep 21

Harvest

Activity	Window	Notes
Direct sow	Mar 5 – Jul 18	Plant outdoors in this window.
Harvest	Apr 29 – Sep 21	Expected harvest from typical days to harvest.

Blue fill is usually too cold for this plant. Dashed lines are typical last and first frost. Adjust a week or two for your conditions.

Planting and growing across the year

Planting is the sow / plant-out window. Growing is daytime air versus this plant’s ideal (59 – 81 °F) and tolerable (39 – 90 °F) ranges.

Planting uses sow / plant-out rules (frost, soil germination, night, and last-sow): green when plantable, blue diagonal when nights or soil are too cold, amber cross-hatch when too hot, faint for other calendar limits. Growing shows daytime air against this plant’s ideal and tolerable ranges across the year.

Key dates

Typical last spring frostApril 2

Safer last spring frostApril 2

Typical first fall frostOctober 25

Safer first fall frostOctober 25

Frost-free days205

Outdoor sow dateMarch 5

Direct sow windowMarch 5 – July 18

Suitable growing windowMarch 5 – December 2 (273 days)

Expected harvestApril 29 – September 21

How these dates are judged

Ideal conditions: Daytime air from 59 – 81 °F.
Suitable conditions: Daytime air from 39 – 90 °F.
Last frost and first frost: Typical spring and fall frost dates for Seattle, shown in the key dates.
Days to harvest: 55–65 days from seed, from typical days to harvest.
Sowing window: Dated sow and harvest bars use frost dates, soil minima, night limits, and last-sow count-back from typical crop timing. The year strip and weekly chart use the same window: air ratings only colour weeks inside it.

Growing window for Swiss chard: Mar 5 – Dec 2 (273 days)

Planting window for Swiss chard: Mar 5 – Jul 18 (136 days)

Usually too cold: Jan 1 – Mar 1; Nov 30 – Dec 31

Outdoors: weekly temperatures and windows

Temperatures across the year for Seattle. Shaded bands are this plant’s ideal and tolerable daytime air ranges. Growing is daytime air suitability; Planting is sow / plant-out conditions (same colour language). Window brackets mark each stretch.

Ideal range
Tolerable range
Possible min to max
Average min to max
Suitable
Tolerable
Too cold
Too hot

Selected week · tap a week or use the arrows

Week 10 · Mar 2 – Mar 8

Average 36 to 48 °F · Possible 28 to 56 °F

Growing: too cold (inside window)

Planting: suitable

A week is in range when its average low and high sit inside the tolerance band 39 to 90 °F; it is suitable when that average range also overlaps the ideal 59 to 81 °F band and possible readings stay within 39 °F to 90 °F. Crossing a possible limit, or missing the ideal band, makes it tolerable; a possible low below 39 °F makes it tolerable. When a sowing window is calculated, weeks outside that window are uncoloured even if air is in range.

Based on average frost dates.

Show all 53 weeks

Cover method weekly charts

Outdoor weekly chart is above. Open a cover chart only if you grow under fleece, a cold frame, or an unheated greenhouse.

Other plants for Seattle

Calculated by Plan & Plant · Method · Data 2019–2026

Frost and suitability dates are typical figures from climate statistics. Microclimates vary; they are not a guarantee.

How we calculated this

Data: ERA5-Land via Open-Meteo, cell 47.60, -122.30, years 2019–2026 (not a 30-year climate normal yet).
Typical and safer dates: Typical last frost is the date after which half of winters in this sample had no more frost; safer is later in the sample so fewer winters still frosted.
Crop rule: Local windows for Swiss chard from frost dates, temperature ratings, and crop timing rules.
Confidence: Provisional — short or thin sample for this place.
Full methodology (algorithm 2026-10-season-6).

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