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Last and first frost dates in Hamamatsu

Japan

In Hamamatsu the last spring frost usually comes around 24 February and the first autumn frost around 18 December, which leaves about 297 frost-free days (median of 2016–2025). Tomato seedlings can go into open ground from 5 April to 28 August.

Last spring frostaround 24 February
First autumn frostaround 18 December
Frost-free days297 days

Median of 2016–2025 for the 25 km grid cell of the city: the last day at or below 0 °C in spring and the first in autumn (ERA5 reanalysis via Open-Meteo). In a cold year a frost can come a week or two later — Greenly warns 48 hours ahead.

When is the last frost in Hamamatsu?

The last frost in Hamamatsu usually comes around 24 February: that is the median of 2016–2025, so in about half of those years the last night at or below 0 °C came later. Hardy crops start before it and frost-tender ones only after it: in the table below arugula can go into open ground from 3 February, while corn waits until 21 March. The first autumn frost follows around 18 December, about 297 days later: harvest or cover frost-tender crops before then.

When to sow and plant

CropSow for seedlingsPlant out in a greenhouseOpen ground
Achocha2 January – 9 September11 February – 19 October4 March – 19 October
Ageratumfrom 18 January—from 5 April
Arugula——sow 3 February – 13 November
Basil4 March – 16 October11 April – 23 November2 May – 23 November
Beet——sow 3 February – 19 October
Bell Pepper10 February – 29 June11 April – 28 August2 May – 28 August
Black-eyed Susanfrom 11 December—from 4 March
Bok Choy7 January – 27 October11 February – 1 December4 March – 1 December
Borage——sow 3 March – 24 October
Broad bean——sow 3 February – 9 September
Broccoli——sow 3 February – 2 September
Brussels Sprouts29 November – 31 July13 January – 14 September3 February – 14 September
Busy Lizziefrom 9 December—from 3 March
Cabbage——sow 3 February – 10 August
Calendula——sow from 3 February
Carrot——sow 3 February – 25 September
Cauliflower2 December – 2 September13 January – 14 October3 February – 14 October
Celeriac26 November – 30 June11 February – 15 September4 March – 15 September
Celery26 November – 10 July11 February – 25 September4 March – 25 September
Celosiafrom 10 Februaryfrom 27 Marchfrom 17 April
Chamomile——sow 3 February – 14 October
Chayote2 December – 23 June28 February – 19 September21 March – 19 September
Chickpea——sow 3 February – 30 August
Chicory19 December – 24 September—3 February – 19 October
Chili Pepper10 February – 5 August11 April – 4 October2 May – 4 October
China asterfrom 18 Februaryfrom 11 Aprilfrom 2 May
Chives——sow 3 February – 5 October
Cilantro——sow 3 February – 15 October
Corn——sow 21 March – 30 August
Corn poppy——sow from 3 February
Cosmosfrom 10 Februaryfrom 27 Marchfrom 17 April
Cucumber14 March – 5 September11 April – 3 October2 May – 3 October
Daikon——sow 3 February – 12 October
Delphiniumfrom 15 November—from 3 February
Dill——sow 3 February – 25 October
Edging lobeliafrom 10 December—from 4 March
Eggplant10 February – 29 June11 April – 28 August2 May – 28 August
Florence fennel28 December – 9 September11 February – 24 October4 March – 24 October
Foxglovefrom 28 October—from 3 February
Garden sorrel——sow 3 February – 13 October
Green Beans——sow 17 April – 7 September
Hollyhock——sow from 3 February
Hyssop——sow 3 February – 5 September
Kale——sow 3 February – 7 October
Kiwano11 February – 12 September15 March – 14 October5 April – 14 October
Kohlrabi——sow 3 February – 17 October
Leek4 November – 21 June13 January – 30 August3 February – 30 August
Lemon balm——sow 3 February – 9 October
Lettuce——sow 3 February – 22 October
Lisianthusfrom 18 Octoberfrom 13 Januaryfrom 3 February
Lovage——sow from 3 February
Luffa28 February – 7 July11 April – 18 August2 May – 18 August
Marigoldfrom 31 Decemberfrom 11 Februaryfrom 4 March
Marjoram10 February – 24 September—2 May – 23 November
Melon14 March – 23 August11 April – 20 September2 May – 20 September
Microgreens——sow 17 April – 4 December
Moringa4 March – 29 September28 April – 23 November19 May – 23 November
Moss rosefrom 16 December—from 3 March
Mustard greens——sow 3 February – 3 November
Napa cabbage9 January – 4 October11 February – 6 November4 March – 6 November
Nasturtiumfrom 4 Januaryfrom 11 Februaryfrom 4 March
Okra28 February – 17 September11 April – 29 October2 May – 29 October
Oregano14 November – 14 September13 January – 13 November3 February – 13 November
Pansyfrom 18 Novemberfrom 13 Januaryfrom 3 February
Parsley——sow 3 February – 3 October
Parsnip——sow 3 February – 22 August
Peanut5 March – 13 August11 April – 19 September2 May – 19 September
Peas——sow 3 February – 5 October
Petuniafrom 7 Februaryfrom 11 Aprilfrom 2 May
Physalis29 January – 10 August15 March – 24 September5 April – 24 September
Pumpkin28 February – 12 July11 April – 23 August2 May – 23 August
Purple coneflowerfrom 12 November—from 3 February
Radish——sow 3 February – 18 November
Sage25 November – 10 September13 January – 29 October3 February – 29 October
Scarlet sagefrom 22 January—from 5 April
Snapdragonfrom 9 Novemberfrom 13 Januaryfrom 3 February
Soybean——sow 2 May – 29 September
Spinach——sow 3 February – 24 October
Stevia25 January – 1 August15 March – 19 September5 April – 19 September
Stock——sow from 3 February
Sunflower——sow from 17 April
Sweet alyssum——sow from 3 February
Sweet Corn12 February – 24 September6 March – 16 October27 March – 16 October
Sweet peafrom 2 Decemberfrom 13 Januaryfrom 3 February
Sweet William——sow from 3 February
Swiss Chard——sow 3 February – 19 October
Thyme——sow 3 February – 30 August
Tomato22 January – 7 July15 March – 28 August5 April – 28 August
Turnip——sow 3 February – 21 October
Watercress——sow 3 February – 1 November
Watermelon14 March – 11 August11 April – 8 September2 May – 8 September
Zinniafrom 24 Marchfrom 28 Aprilfrom 19 May
Zucchini21 March – 10 September11 April – 1 October2 May – 1 October

Planting out: a week after the last frost once the soil is warm enough for the crop; frost-hardy crops three weeks before it; an unheated greenhouse three weeks earlier. Seedlings are sown so they are ready on that day. 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.

When the soil warms up in Hamamatsu

The day the top 7 cm of soil first averages each temperature over a week, median of 2016–2025 (ERA5 via Open-Meteo). The soil reaches 10 °C 8 days after the last spring frost and 15 °C 40 days after it.

SoilDateAgainst the last spring frost
5 °Calready in the first week of January—
10 °C4 March8 days later
15 °C5 April40 days later
18 °C2 May67 days later

Frost dates near Hamamatsu

Of the nearest cities on our list, the last spring frost ends earliest in Osaka (14 March) and latest in Kyoto (22 March).

CityDistanceLast spring frostFirst autumn frost
Nagoya92 km22 March10 December
Kyoto182 km22 March7 December
Osaka204 km14 March17 December
Tokyo209 km17 March14 December
Okayama348 km20 March15 December

Seeds, seedlings and markets in Hamamatsu

Within 15 km of Hamamatsu OpenStreetMap lists 5 garden centres, 6 farm-supply shops, 5 markets and 39 farm shops (collected 28 October 2026).

Places: © OpenStreetMap contributors, ODbL.

What to grow at home in winter in Hamamatsu

Frosts in Hamamatsu usually come from about 18 December to about 24 February. These plants have indoor care in their Greenly cards and are harvested quickly, so they can be sown on a windowsill in winter.

Weather in Hamamatsu by month

Average weather in Hamamatsu over 2016–2025: the warmest month is August. Months that average 20 °C or more by day: May–October (23–31.3 °C). Months that average 30 °C or more by day: August (31.3 °C). No month averages below 0 °C at night; the coldest nights, in January, average 1.7 °C. About 2359 mm of rain falls in a year, on 141 days; June is the wettest month (357 mm) and January the driest (57 mm).

MonthDay, °CNight, °CRain, mmRainy days
January101.7575
February11.22.3926
March15.35.917612
April19.410.421311
May23.214.624412
June26.118.835715
July29.923.331016
August31.324.421817
September28.221.327718
October2315.422714
November189.41179
December12.44716

Average of the daily highs and lows, rain per month and days with at least 1 mm (ERA5 via Open-Meteo, the same grid cell as the frost dates).

Planted in autumn

CropWhen to plant
Bearded Irisby 18 November
Crocusby 18 November
Daffodilby 18 November
Garlic18 November – end of December
Grape hyacinthby 18 November
Helleboreby 18 November
Hyacinthby 18 November
Lilyby 18 November
Ornamental onionby 18 November
Peonyby 18 November
Saffronby 18 November
Snowdropby 18 November
Tulipby 18 November
Wild garlicby 18 November

From a month before the first autumn frost, so the roots grow before winter, to the late-planting limit on each crop’s page (about two weeks before the ground freezes, by ten years of weather).