When to plant parsley in Philadelphia

In Philadelphia, typical last spring frost is April 3 and typical first fall frost is November 12. Typical last spring frost: April 3. Parsley in Philadelphia is a good fit outdoors. The suitable growing window of 91 days covers the 70–80 days this plant usually needs.

Parsley

How to grow Parsley Philadelphia climate Weekly temperatures and windows

Where are you growing?

Comfortable

Tight fit in greenhouse

Comfortable in a cold frame

Parsley in Philadelphia is a good fit outdoors. The suitable growing window of 91 days covers the 70–80 days this plant usually needs.

When to plantMarch 16 – May 10

Harvest: May 25 – July 29
Season vs crop: 91 grow days vs 70–80 needed
Typical frost (last spring – first fall): April 3 – November 12

Parsley in Philadelphia is a good fit outdoors. The suitable growing window of 91 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 row91

Days to harvest70–80 days from seed

Mar 16 – May 10

Direct sow

May 11 – May 24

Grow outdoors

May 25 – Jul 29

Harvest

Activity	Window	Notes
Direct sow	Mar 16 – May 10	Plant outdoors in this window.
Grow outdoors	May 11 – May 24	Plants grow outdoors until harvest.
Harvest	May 25 – Jul 29	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 3

Low-risk last spring frostApril 13

Typical first fall frostNovember 12

Low-risk first fall frostNovember 5

Frost-free days222

Outdoor sow dateMarch 16

Direct sow windowMarch 16 – May 10

Suitable growing windowMarch 16 – June 14 (91 days)

Expected harvestMay 25 – July 29

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 Philadelphia, 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 Philadelphia

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 Philadelphia use ERA5-Land cell 39.95, -75.16. How we calculated this · Algorithm 2026-10-season-10.

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