When to plant parsley in Washington

In Washington, typical last spring frost is April 1 and typical first fall frost is November 11. Typical last spring frost: April 1. Parsley in Washington is a good fit outdoors. The suitable growing window of 85 days covers the 70–80 days this plant usually needs.

Parsley

How to grow Parsley Washington climate Weekly temperatures and windows

Where are you growing?

Comfortable

Tight fit in greenhouse

Comfortable in a cold frame

Parsley in Washington is a good fit outdoors. The suitable growing window of 85 days covers the 70–80 days this plant usually needs.

When to plantMarch 14 – May 8

Harvest: May 23 – July 27
Season vs crop: 85 grow days vs 70–80 needed
Typical frost (last spring – first fall): April 1 – November 11

Parsley in Washington is a good fit outdoors. The suitable growing window of 85 days covers the 70–80 days this plant usually needs.

Planting conditions

Direct sow
Grow outdoors
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 row85

Days to harvest70–80 days from seed

Mar 14 – May 8

Direct sow

May 9 – May 22

Grow outdoors

May 23 – Jul 27

Harvest

Activity	Window	Notes
Direct sow	Mar 14 – May 8	Plant outdoors in this window.
Grow outdoors	May 9 – May 22	Plants grow outdoors until harvest.
Harvest	May 23 – Jul 27	Expected harvest from typical days to harvest.

Direct sow
Grow outdoors
Harvest

Blue fill is usually too cold for this plant. Dashed lines are typical last and first frost (35 seasons (1991–2025)). 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 (15 – 21 °C59 – 70 °F15 – 21 °C (59 – 70 °F)) and tolerable (4 – 27 °C39 – 81 °F4 – 27 °C (39 – 81 °F)) ranges.

Ideal / plantable
Tolerable
Too cold
Too hot
Outside window

Planting uses sow / plant-out rules; growing shows daytime air against this plant’s ideal and tolerable ranges.

Key dates

Typical last spring frostApril 1

Low-risk last spring frostApril 11

Typical first fall frostNovember 11

Low-risk first fall frostNovember 5

Frost-free days223

Outdoor sow dateMarch 14

Direct sow windowMarch 14 – May 8

Suitable growing windowMarch 14 – June 6 (85 days)

Expected harvestMay 23 – July 27

How these dates are judged

Ideal conditions: Daytime air from 15 – 21 °C59 – 70 °F15 – 21 °C (59 – 70 °F).
Suitable conditions: Daytime air from 4 – 27 °C39 – 81 °F4 – 27 °C (39 – 81 °F).
Last frost and first frost: Typical spring and fall frost dates for Washington, shown in the key dates.
Days to harvest: 70–80 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. Air ratings on the weekly chart colour only weeks inside that same window — see weekly temperatures and windows.

Other plants for Washington

Calculated by Plan & Plant. Method. Data 35 seasons (1991–2025).

Frost and suitability dates are typical figures from climate statistics.

Based on 35 years (1991–2025) of ERA5-Land data from Open-Meteo, for an area of about 10 km. Typical dates, not a guarantee.

Dates for Washington use ERA5-Land cell 38.91, -77.04. How we calculated this · Algorithm 2026-10-season-10.

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