When to plant tomatoes in Juneau: 3 July – 28 July

In Juneau, tomato: sow for seedlings from 21 April to 6 June; plant into a greenhouse from 12 June to 28 July; plant out into open ground from 3 July to 28 July.

Tomato in Juneau: soil, season and weather

In Juneau the soil, not frost, sets the date: the last frost is over around 27 May, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 3 July, 37 days later. 95 days separate planting out (3 July) from the first autumn frost (6 October); the card's 70 days to the first harvest leave 25 for picking, so a start 3 weeks late would still fit.

Last spring frost	27 May
Top 7 cm of soil at 15 °C	3 July, 37 days after the last frost
Into an unheated greenhouse	12 June – 28 July; June outside: 5.6 °C at night, 12.5 °C by day; card 16–27 °C
First autumn frost	6 October, 95 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	11 September – 6 October
Days left for picking	25
Daylight	16:31 on 12 May, 18:07 on 3 July
Watering outdoors when fruiting (card)	every 3 days; the driest month, July, has 19 rainy days

Tomato in Juneau: care after planting

Planted on 3 July: in the first weeks water every 4 days.

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

3 July — feed: balanced (NPK)
31 July — feed: nitrogen

Pests and diseases of tomato 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 tomato season

No month of the season averages above the tomato card's 16–27 °C by day; the warmest, July, averages 14.6 °C. Months that stay below 16 °C even by day on average: July–October (4.1–14.6 °C). Nights average below 16 °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
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

Tomato in nearby cities

All the nearest cities on our list plant tomato earlier than Juneau; the closest date is in Whitehorse, 4 days earlier.

City	Distance	Date	Difference
Whitehorse	272 km	29 June – 20 July	4 days earlier
Anchorage	923 km	22 June – 24 June	11 days earlier
Fairbanks	1,008 km	8 June – 15 July	25 days earlier
Yellowknife	1,189 km	22 June – 26 July	11 days earlier
Vancouver	1,244 km	28 May – 28 July	36 days earlier
Victoria	1,316 km	14 May – 31 August	50 days earlier

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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