When to plant potato 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. Potato in Denver is a good fit outdoors. The suitable growing window of 162 days covers the 70–125 days this plant usually needs.

Potato

How to grow Potato Denver climate Weekly temperatures and windows

Where are you growing?

Comfortable

Not realistic in greenhouse

Comfortable in a cold frame

Potato in Denver is a good fit outdoors. The suitable growing window of 162 days covers the 70–125 days this plant usually needs.

When to plantApril 21 – June 18

Harvest: June 30 – October 25
Season vs crop: 162 grow days vs 70–125 needed
Typical frost (last spring – first fall): May 8 – October 13

Potato in Denver is a good fit outdoors. The suitable growing window of 162 days covers the 70–125 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 row162

Days to harvest70–125 days from planting

Apr 21 – Jun 18

Direct sow

Jun 19 – Jun 29

Grow outdoors

Jun 30 – Oct 25

Harvest

Activity	Window	Notes
Direct sow	Apr 21 – Jun 18	Plant outdoors in this window.
Grow outdoors	Jun 19 – Jun 29	Plants grow outdoors until harvest.
Harvest	Jun 30 – Oct 25	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 – 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 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 18

Suitable growing windowApril 21 – September 29 (162 days)

Expected harvestJune 30 – October 25

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 Denver, 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 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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