When to plant fava bean in St. Louis

In St. Louis, typical last spring frost is April 1 and typical first fall frost is November 10. Typical last spring frost: April 1. Fava bean in St. Louis is not realistic outdoors: 71 suitable days are fewer than the 80 days this plant usually needs.

Fava bean

How to grow Fava bean St. Louis climate Weekly temperatures and windows

Where are you growing?

Not realistic outdoors

Not realistic in greenhouse

Not realistic in a cold frame

Fava bean in St. Louis is not realistic outdoors: 71 suitable days are fewer than the 80 days this plant usually needs.

When to plantMarch 4 – May 31

Harvest: May 23 – October 9
Season vs crop: 71 grow days vs 80–110 needed
Typical frost (last spring – first fall): April 1 – November 10

Fava bean in St. Louis is not realistic outdoors: 71 suitable days are fewer than the 80 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
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 row71

Days to harvest80–110 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 – 24 °C39 – 75 °F4 – 24 °C (39 – 75 °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 15

Typical first fall frostNovember 10

Low-risk first fall frostOctober 31

Frost-free days222

Outdoor sow dateMarch 4

Direct sow windowMarch 4 – May 31

Suitable growing windowMarch 4 – May 13 (71 days)

Expected harvestMay 23 – October 9

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 – 24 °C39 – 75 °F4 – 24 °C (39 – 75 °F).
Last frost and first frost: Typical spring and fall frost dates for St. Louis, shown in the key dates.
Days to harvest: 80–110 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 St. Louis

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 St. Louis use ERA5-Land cell 38.63, -90.20. How we calculated this · Algorithm 2026-10-season-10.

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