Last and first frost dates in Karlsruhe

When is the last frost in Karlsruhe?

The last frost in Karlsruhe usually comes around 5 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 15 March, while corn waits until 18 April. The first autumn frost follows around 19 November, about 228 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 Karlsruhe

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 3 days before the last spring frost and 15 °C 35 days after it.

Frost dates near Karlsruhe

Of the nearest cities on our list, the last spring frost ends earliest in Strasbourg (6 April) and latest in Heidelberg (20 April).

Seeds, seedlings and markets in Karlsruhe

Within 15 km of Karlsruhe OpenStreetMap lists 25 garden centres, 3 farm-supply shops, 18 plant nurseries, 23 markets and 59 farm shops (collected 28 October 2026). The nearest garden centre to the city centre is ZG Raiffeisen Markt, 2 km away.

• ZG Raiffeisen Markt — garden centre
  Fautenbruchstraße 35, 76137 Karlsruhe · Mon–Fri 08:30–19:00, Sat 08:30–16:00 · 2 km · zg-raiffeisen.de
• Raiffeisenmarkt Grötzingen — farm supply · sells seed
  Schultheiß-Kiefer-Straße 8, 76229 Karlsruhe · Mon–Fri 08:00–18:00; Sat 08:00–12:30; public holidays closed · 7 km · raiffeisen-groetzingen.de
• Blumenmarkt — market
  Mon–Sat 09:00–20:00; Sun, public holidays closed · 0 km
• Kraut + Rüben — farm shop
  Steiermärker Straße 16a, 76227 Karlsruhe · Mon–Fri 08:30–18:00; Sat 08:00–13:00; Sun, public holidays closed · 5 km · krautundrueben-hofladen.de
• Bambusgarten-Bulach — garden centre
  Landgrabenstraße 62a, 76135 Karlsruhe · Mar–Oct Sat 10:00–16:00 · 3 km · bambusgarten-bulach.de
• Weingärtner´s Garten- und Landhandel — farm supply
  Apothekenstraße 1, 76356 Weingarten (Baden) · Mon–Wed 08:30–12:30; Thu–Fri 08:30–12:30, 15:00–18:00; Sat 08:00–13:00 · 11 km · weingärtners-landhandel.de

• Where to buy seeds and seedlings in Karlsruhe
• Selling your own harvest in Germany

Places: © OpenStreetMap contributors, ODbL.

Weather in Karlsruhe by month

Average weather in Karlsruhe over 2016–2025: the warmest month is August. Months that average 20 °C or more by day: June–September (22–26.4 °C). No month averages below 0 °C at night; the coldest nights, in January, average 0.2 °C. About 837 mm of rain falls in a year, on 145 days; January is the wettest month (86 mm) and August the driest (54 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).