GreenlyGardening in Luxembourg: climate, frost dates and crops by region
We worked out the season of 3 cities of Luxembourg from ten years of weather: the frost-free season lasts from 202 days in Ettelbruck to 217 days in Luxembourg. The last spring frost comes first in Luxembourg (around 15 April) and last in Ettelbruck (around 27 April).
Climate zones of Luxembourg
By the days between the last spring frost and the first autumn frost.
| Zone | Cities | Frost-free days | Last spring frost | First autumn frost |
|---|---|---|---|---|
| 210–269 frost-free days | Luxembourg, Esch-sur-Alzette | 216 – 217 | 15 April – 16 April | 18 November |
| 150–209 frost-free days | Ettelbruck | 202 | 27 April | 15 November |
How the regions of Luxembourg differ
In all 3 cities at least one month averages below 0 °C at night; the longest such winter is in Ettelbruck (January).
Which crops suit which part of Luxembourg
Season long enough: the days from planting to the first autumn frost cover the days to the first harvest on the plant card. 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 | Season long enough | Tight or too short |
|---|---|---|---|
| Tomato | 15 May (Ettelbruck) – 29 July (Luxembourg) | all 3 | — |
| Cucumber | 6 June (Ettelbruck) – 3 September (Luxembourg) | all 3 | — |
| Bell Pepper, Eggplant | 6 June (Ettelbruck) – 29 July (Luxembourg) | all 3 | — |
| Zucchini | 6 June (Ettelbruck) – 1 September (Luxembourg) | all 3 | — |
| Pumpkin | 6 June (Ettelbruck) – 24 July (Luxembourg) | all 3 | — |
| Watermelon | 6 June (Ettelbruck) – 9 August (Luxembourg) | all 3 | — |
| Peas | 25 March (Luxembourg) – 5 September (Luxembourg) | all 3 | — |
| Garlic, Tulip, Daffodil, Crocus, Hyacinth | Autumn planting: 16 October (Ettelbruck) – end of December (Ettelbruck) | — | — |
Cities of Luxembourg: weather in numbers
| City | Frost-free days | Warmest month, day | Coldest month, night | Rain a year | Driest month | Places to buy |
|---|---|---|---|---|---|---|
| Ettelbruck | 202 | August, 23.5 °C | January, -0.6 °C | 904 mm | April | 12 |
| Luxembourg | 217 | August, 24.2 °C | January, -0.2 °C | 862 mm | April | 32 |
| Esch-sur-Alzette | 216 | August, 23.5 °C | January, -0.4 °C | 904 mm | April | 26 |
ERA5 2016–2025 via Open-Meteo, 25 km grid cell of each city; dates by the Greenly calendar and the plant cards.
