GreenlyFrost dates and when to plant in Tasmania
Australia
In Tasmania the last spring frost comes between 23 August (Devonport) and 28 August (Launceston) — the median of 2016–2025 in 2 cities. The first autumn frost comes between 8 June (Launceston) and 26 June (Devonport). The frost-free season lasts 284–307 days. One of the 3 cities had no frost at all. Tomato: plant out into open ground 7 November – 5 March, earliest in Launceston, latest in Devonport.
Frost dates by city in Tasmania
| City | Last spring frost | First autumn frost | Frost-free days | Climate zone | Tomato: window |
|---|---|---|---|---|---|
| Devonport | 23 August | 26 June | 307 | 270 frost-free days or more | 22 November – 5 March |
| Launceston | 28 August | 8 June | 284 | 270 frost-free days or more | 7 November – 16 February |
| Hobart | none in ten years | none in ten years | — | No frost in ten years | — |
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 to plant in Tasmania: windows by crop
The earliest start and the latest end among the cities here, each with its city; every city’s own window is on its page. 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.
| Crop | Planting out or sowing |
|---|---|
| Tomato | 7 November (Launceston) – 5 March (Devonport) |
| Cucumber | 12 December (Devonport) – 10 April (Devonport) |
| Bell Pepper, Eggplant | 12 December (Devonport) – 5 March (Devonport) |
| Zucchini | 12 December (Devonport) – 8 April (Devonport) |
| Pumpkin | 12 December (Devonport) – 29 February (Devonport) |
| Watermelon | 12 December (Devonport) – 16 March (Devonport) |
| Peas | 2 August (Devonport) – 12 April (Devonport) |
| Garlic | Autumn planting: 1 April (Hobart) – end of June (Hobart) |
| Tulip, Daffodil, Crocus, Hyacinth | Autumn planting: by 9 May (Launceston) |
Weather by month in Tasmania
Across the 3 cities the warmest month is January (average days 20.5 … 24.7 °C) and the coldest July (average nights 4.3 … 5.4 °C). No city here averages below 0 °C at night in any month.
| Month | Day, °C | Night, °C | Rain, mm |
|---|---|---|---|
| January | 20.5 … 24.7 °C | 12.3 … 13.3 °C | 67 |
| February | 19.5 … 23.3 °C | 11.7 … 12.7 °C | 55 |
| March | 18.4 … 21.7 °C | 11.1 … 11.8 °C | 64 |
| April | 15.8 … 17.8 °C | 8.8 … 9.4 °C | 57 |
| May | 13.1 … 14.8 °C | 6.4 … 7.4 °C | 67 |
| June | 11.2 … 12.7 °C | 4.7 … 5.8 °C | 83 |
| July | 10.8 … 12.1 °C | 4.3 … 5.4 °C | 86 |
| August | 11.5 … 12.9 °C | 4.6 … 5.6 °C | 77 |
| September | 13 … 14.5 °C | 5.8 … 6.4 °C | 69 |
| October | 14.6 … 16.5 °C | 7 … 7.7 °C | 104 |
| November | 16.6 … 19.3 °C | 8.9 … 9.7 °C | 73 |
| December | 18.4 … 21.9 °C | 10.4 … 11.1 °C | 64 |
Day and night: the lowest … highest monthly average among the cities; rain: the middle city (ERA5 via Open-Meteo).
