When to plant parsley in Denver

In Denver, typical last spring frost is May 8 and typical first fall frost is October 13. Typical last spring frost: May 8. Parsley in Denver is not realistic outdoors: 59 suitable days are fewer than the 70 days this plant usually needs.

Parsley

How to grow Parsley Denver climate Weekly temperatures and windows

Where are you growing?

Not realistic outdoors

Not realistic in greenhouse

Not realistic in a cold frame

Parsley in Denver is not realistic outdoors: 59 suitable days are fewer than the 70 days this plant usually needs.

When to plantApril 21 – June 15

Harvest: June 30 – September 3
Season vs crop: 59 grow days vs 70–80 needed
Typical frost (last spring – first fall): May 8 – October 13

Parsley in Denver is not realistic outdoors: 59 suitable days are fewer than the 70 days this plant usually needs.

Cover methods on this page (fleece, cold frame, unheated greenhouse) do not add enough season for this crop here. Pick another plant from the list below, or use a heated greenhouse.

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 row59

Days to harvest70–80 days from seed

No planting window is recorded for this place.

Too cold
Frost line

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 frostMay 8

Low-risk last spring frostMay 19

Typical first fall frostOctober 13

Low-risk first fall frostSeptember 25

Frost-free days157

Outdoor sow dateApril 21

Direct sow windowApril 21 – June 15

Suitable growing windowApril 21 – June 18 (59 days)

Expected harvestJune 30 – September 3

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 Denver, 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 Denver

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 Denver use ERA5-Land cell 39.70, -105.00. How we calculated this · Algorithm 2026-10-season-10.

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