When to plant potato 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. Potato in Washington is doable with planning outdoors. 107 suitable days are enough for fast varieties (70 days) but not slow ones (125 days).

Potato

How to grow Potato Washington climate Weekly temperatures and windows

Where are you growing?

Tight fit

Tight fit in greenhouse

Tight fit in a cold frame

Potato in Washington is doable with planning outdoors. 107 suitable days are enough for fast varieties (70 days) but not slow ones (125 days).

When to plantMarch 15 – June 6

Harvest: May 24 – November 8
Season vs crop: 107 grow days vs 70–125 needed
Typical frost (last spring – first fall): April 1 – November 11

Potato in Washington is doable with planning outdoors. 107 suitable days are enough for fast varieties (70 days) but not slow ones (125 days).

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 row107

Days to harvest70–125 days from planting

Mar 15 – Jun 6

Direct sow

May 24 – Nov 8

Harvest

Activity	Window	Notes
Direct sow	Mar 15 – Jun 6	Plant outdoors in this window.
Harvest	May 24 – Nov 8	Expected harvest from typical days to harvest.

Direct sow
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 – 24 °C59 – 75 °F15 – 24 °C (59 – 75 °F)) and tolerable (7 – 30 °C45 – 86 °F7 – 30 °C (45 – 86 °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 15

Direct sow windowMarch 15 – June 6

Suitable growing windowMarch 15 – June 29 (107 days)

Expected harvestMay 24 – November 8

How these dates are judged

Ideal conditions: Daytime air from 15 – 24 °C59 – 75 °F15 – 24 °C (59 – 75 °F).
Suitable conditions: Daytime air from 7 – 30 °C45 – 86 °F7 – 30 °C (45 – 86 °F).
Last frost and first frost: Typical spring and fall frost dates for Washington, shown in the key dates.
Days to harvest: 70–125 days from planting, 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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