When to plant watermelons in Rotorua: 10 December – 14 February

In Rotorua, watermelon: sow for seedlings from 22 October to 17 January; plant into a greenhouse from 19 November to 14 February; plant out into open ground from 10 December to 14 February. For plants and seeds, the places nearby include Gardeners Landscape Supplies (garden centre, 2 km) and Palmers (garden centre, 2 km); addresses and opening hours are below.

Watermelon in Rotorua: soil, season and weather

In Rotorua the soil, not frost, sets the date: the last frost is over around 10 September, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 10 December, 91 days later.

Last spring frost	10 September
Top 7 cm of soil at 18 °C	10 December, 91 days after the last frost
Into an unheated greenhouse	19 November – 14 February; November outside: 9.6 °C at night, 19 °C by day; card 18–35 °C
First autumn frost	25 May, 167 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	7 February – 13 April
Days left for picking	108
Daylight	14:05 on 12 November, 14:45 on 10 December
Watering outdoors when fruiting (card)	every 5 days; the driest month, January, has 12 rainy days

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

Watermelon in Rotorua: care after planting

Planted on 10 December: in the first weeks water every 5 days.

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

10 December — 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 Rotorua during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, February, averages 22.8 °C. Months that stay below 18 °C even by day on average: April (17.3 °C) and May (14.3 °C). Nights average below 18 °C in every month of the season, from 6.4 °C to 12.8 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
December	21.3	11.5	113	14	14:48
January	22.7	12.3	89	12	14:31
February	22.8	12.8	104	11	13:31
March	20.3	10.8	94	11	12:23
April	17.3	8.9	91	10	11:07
May	14.3	6.4	107	10	10:05

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Rotorua, Napier is 37 days earlier and Wellington 7 days later.

City	Distance	Date	Difference
Tauranga	51 km	from 4 December	6 days earlier
Hamilton (New Zealand)	94 km	3 December – 5 March	7 days earlier
Napier	161 km	from 3 November	37 days earlier
Gisborne	165 km	from 7 November	33 days earlier
Palmerston North	253 km	4 December – 11 March	6 days earlier
Wellington	372 km	from 17 December	7 days later

Where to buy watermelon plants and seeds near Rotorua

Buy plants ready to set out from 10 December to 14 February (from 19 November to 14 February for an unheated greenhouse); seed for raising your own is sown from 22 October to 17 January. Within 15 km of Rotorua OpenStreetMap lists 4 garden centres, 3 farm-supply shops, 1 plant nursery and 4 markets (collected 20 October 2026).

Gardeners Landscape Supplies — garden centre
Sala Street 159, 3010 Rotorua · Mon–Fri 07:30–17:00; Sat–Sun 08:00–16:00 · 2 km
Palmers — garden centre
Mon–Sun 08:00–17:30 · 2 km
Tikitere Gardens and Nursery — garden centre
10 km
Full of Posies Flower Farm — garden centre
12 km

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.

Questions