When to plant watermelon in Birmingham

In Birmingham, typical last spring frost is April 16 and typical first fall frost is November 14. Typical last spring frost: April 16. Watermelon in Birmingham is not realistic outdoors: 0 suitable days are fewer than the 70 days this plant usually needs.

Watermelon

How to grow Watermelon Birmingham climate Weekly temperatures and windows

Where are you growing?

Not realistic outdoors

Not realistic in greenhouse

Not realistic in a cold frame

Watermelon in Birmingham is not realistic outdoors: 0 suitable days are fewer than the 70 days this plant usually needs.

When to plantJune 19 – June 26

Harvest: August 28 – October 23
Season vs crop: 0 grow days vs 70–100 needed
Typical frost (last spring – first fall): April 16 – November 14

Watermelon in Birmingham is not realistic outdoors: 0 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 row0

Days to harvest70–100 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 (21 – 35 °C70 – 95 °F21 – 35 °C (70 – 95 °F)) and tolerable (16 – 38 °C61 – 100 °F16 – 38 °C (61 – 100 °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 16

Low-risk last spring frostMay 4

Typical first fall frostNovember 14

Low-risk first fall frostOctober 23

Frost-free days211

Outdoor sow dateJune 19

Direct sow windowJune 19 – June 26

Suitable growing window – (0 days)

Expected harvestAugust 28 – October 23

Sow again for a steady harvest

Sow quick crops like radish and lettuce every 1–2 weeks, and slower ones like beans and carrots every 2–3 weeks. Stop when there is not enough time left before your first autumn frost for the crop to mature.

One sowing is enough here; there isn't time for a second.

These dates are deliberately cautious. They come out earlier than common rules like '8 weeks before first frost', because we use the low-risk frost date, leave time for picking and add two weeks for shorter autumn days.

How these dates are judged

Ideal conditions: Daytime air from 21 – 35 °C70 – 95 °F21 – 35 °C (70 – 95 °F).
Suitable conditions: Daytime air from 16 – 38 °C61 – 100 °F16 – 38 °C (61 – 100 °F).
Last frost and first frost: Typical spring and fall frost dates for Birmingham, shown in the key dates.
Days to harvest: 70–100 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 Birmingham

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 Birmingham use ERA5-Land cell 52.50, -1.90. How we calculated this · Algorithm 2026-10-season-10.

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