When to plant watermelons in Juneau: 3 June – 27 June

In Juneau, watermelon: sow for seedlings from 15 April to 30 May; plant into a greenhouse from 13 May to 27 June; plant out into open ground from 3 June to 27 June.

Watermelon in Juneau: soil, season and weather

In the median year the top 7 cm of soil in Juneau does not reach 18 °C, the minimum on the watermelon card, before August; the date follows the last frost (27 May), and the bed stays cooler than the card asks.

Last spring frost	27 May
Into an unheated greenhouse	13 May – 27 June; May outside: 1 °C at night, 8.1 °C by day; card 18–35 °C
First autumn frost	6 October, 125 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	1 August – 25 August
Days left for picking	66
Daylight	16:04 on 6 May, 17:51 on 3 June
Watering outdoors when fruiting (card)	every 5 days; the driest month, June, has 20 rainy days

The same dates in Juneau hold for Cucumber, Bell Pepper, Eggplant, Zucchini and Pumpkin.

Watermelon in Juneau: care after planting

Planted on 3 June: in the first weeks water every 5 days.

Feeding, by the card’s schedule from that day:

3 June — feed: balanced (NPK)

Pests and diseases of watermelon to watch for:

Dates count from the first planting day of the window above; a later planting moves them by as many days.

Weather in Juneau during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, July, averages 14.6 °C. Months that stay below 18 °C even by day on average: June–October (4.1–14.6 °C). Nights average below 18 °C in every month of the season, from -0.5 °C to 8.2 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	12.5	5.6	184	20	18:14
July	14.6	8.2	222	19	17:37
August	14.1	8	313	20	15:27
September	10.4	4.9	379	21	12:54
October	4.1	-0.5	399	22	10:22

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

All the nearest cities on our list plant watermelon later than Juneau; the closest date is in Victoria, 10 days later.

City	Distance	Date	Difference
Whitehorse	272 km	9 July – 31 July	36 days later
Anchorage	923 km	7 July – 16 August	34 days later
Fairbanks	1,008 km	19 June – 26 July	16 days later
Yellowknife	1,189 km	30 June – 6 August	27 days later
Vancouver	1,244 km	22 June – 8 August	19 days later
Victoria	1,316 km	13 June – 11 September	10 days later

Each window starts on the Greenly calendar date and ends on the last day that still leaves the crop’s days to harvest (from its card) before the average first autumn frost, plus six weeks of picking for crops harvested over weeks (tomatoes, peppers, aubergines, cucumbers, courgettes, pumpkins, watermelons, beans) — our rule; earlier in the window is safer.

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