When to plant sweet potato 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. Sweet potato in Boston is doable with planning outdoors. 109 suitable days are enough for fast varieties (85 days) but not slow ones (140 days).

Sweet potato

How to grow Sweet potato Boston climate Weekly temperatures and windows

Where are you growing?

Tight fit

Tight fit in greenhouse

Comfortable in a cold frame

Sweet potato in Boston is doable with planning outdoors. 109 suitable days are enough for fast varieties (85 days) but not slow ones (140 days).

When to plantMay 19 – June 18

Harvest: August 12 – October 30
Season vs crop: 109 grow days vs 85–140 needed
Typical frost (last spring – first fall): April 10 – November 8

Sweet potato in Boston is doable with planning outdoors. 109 suitable days are enough for fast varieties (85 days) but not slow ones (140 days).

Start slips April 7 – May 7, then transplant May 19 – June 18 so the crop can finish outdoors.

Planting conditions

Suitable growing days in a row109

Days to harvest85–140 days from planting

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 (21 – 32 °C70 – 90 °F21 – 32 °C (70 – 90 °F)) and tolerable (16 – 35 °C61 – 95 °F16 – 35 °C (61 – 95 °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 10

Low-risk last spring frostApril 18

Typical first fall frostNovember 8

Low-risk first fall frostOctober 30

Frost-free days211

Earliest indoor seed startApril 7

Latest indoor seed startMay 7

Transplant outdoorsMay 19 – June 18

Direct sow windownot recommended here

Suitable growing windowMay 19 – September 4 (109 days)

Expected harvestAugust 12 – October 30

How these dates are judged

Ideal conditions: Daytime air from 21 – 32 °C70 – 90 °F21 – 32 °C (70 – 90 °F).
Suitable conditions: Daytime air from 16 – 35 °C61 – 95 °F16 – 35 °C (61 – 95 °F).
Last frost and first frost: Typical spring and fall frost dates for Boston, shown in the key dates.
Days to harvest: 85–140 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 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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