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When to plant fava bean in Boston

In Boston, typical last spring frost is April 10 and typical first fall frost is November 8. Typical last spring frost: April 10. Fava bean in Boston is not realistic outdoors: 79 suitable days are fewer than the 80 days this plant usually needs.

Fava bean

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How to grow Fava beanBoston climateWeekly temperatures and windows
Where are you growing?

Not realistic outdoors

Not realistic in greenhouse

Not realistic in a cold frame

Fava bean

Fava bean in Boston is not realistic outdoors: 79 suitable days are fewer than the 80 days this plant usually needs.

When to plantMarch 27 – July 2

Harvest
June 15 – November 10
Season vs crop
79 grow days vs 80–110 needed
Typical frost (last spring – first fall)
April 10 – November 8

Fava bean in Boston is not realistic outdoors: 79 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

Fava bean planting activities across the year: Direct sow, HarvestJFMAMJJASOND~Apr 10~Nov 8
  • 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 row79
Days to harvest80–110 days from seed

No planting window is recorded for this place.

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.

Fava bean planting and growing weeks in BostonJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECPlantingGrowing
Planting uses sow / plant-out rules; growing shows daytime air against this plant’s ideal and tolerable ranges.

Key dates

Typical last spring frostApril 10
Low-risk last spring frostApril 18
Typical first fall frostNovember 8
Low-risk first fall frostOctober 30
Frost-free days211
Outdoor sow dateMarch 27
Direct sow windowMarch 27 – July 2
Suitable growing windowMarch 27 – June 13 (79 days)
Expected harvestJune 15 – November 10

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 Boston, 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 Boston

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 Boston use ERA5-Land cell 42.40, -71.10. How we calculated this · Algorithm 2026-10-season-12.

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