Last and first frost dates in St. Gallen

When is the last frost in St. Gallen?

The last frost in St. Gallen usually comes around 14 April: 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 24 March, while corn waits until 5 May. The first autumn frost follows around 18 November, about 218 days later: harvest or cover frost-tender crops before then.

When to sow and plant

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 St. Gallen

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 1 day after the last spring frost and 15 °C 46 days after it.

Frost dates near St. Gallen

Of the nearest cities on our list, the last spring frost ends earliest in Schaffhausen (9 April) and latest in Chur (31 May).

Seeds, seedlings and markets in St. Gallen

Within 15 km of St. Gallen OpenStreetMap lists 7 garden centres, 3 farm-supply shops, 1 plant nursery, 3 markets and 24 farm shops (collected 27 October 2026). The nearest garden centre to the city centre is R. Sager AG, 10 km away.

• R. Sager AG — garden centre
  Gontenstrasse 47, 9108 Gontenbad · 10 km
• Landi — farm supply
  Mettlenstrasse 10, 9050 Appenzell · Mon–Fri 08:00–18:30; Sat 08:00–17:00 · 10 km · landi.ch
• St. Galler Bauernmarkt — market
  Apr–Nov: Fri 07:00–13:00 · 1 km
• Regioherz — farm shop
  Neugasse 12, 9000 St. Gallen · Mon–Fri 09:00–18:30; Sat 09:00–17:00 · 1 km · regioherz.ch
• Landi — garden centre
  Bischofszellerstrasse 126, 9200 Gossau SG · Mon–Fri 08:00–18:30; Sat 08:00–16:00 · 10 km · landifuerstenland.ch
• Landi Altstätten — farm supply
  Oberrieterstrasse 87, 9450 Altstätten SG · Mon–Fri 08:00–18:30; Sat 08:00–16:00 · 15 km · landialtstaetten.ch

• Where to buy seeds and seedlings in St. Gallen
• Selling your own harvest in Switzerland

Places: © OpenStreetMap contributors, ODbL.

Weather in St. Gallen by month

Average weather in St. Gallen over 2016–2025: the warmest month is July. Months that average 20 °C or more by day: June (22.7 °C), July (23.7 °C) and August (23.5 °C). Nights average below 0 °C in January (-2.4 °C), February (-0.5 °C) and December (-0.7 °C). About 1287 mm of rain falls in a year, on 165 days; August is the wettest month (155 mm) and February the driest (71 mm).

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

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).