When to Plant Tomato

78%
sure
WAIT
Tomato - Sow outside

Wait for a safer window

Forecast low 3.5 C is at or below the crop cold threshold 15 C.

78% local confidence

Field readings
Night3.5 C lows
Soil10 C minimum
Rain42 mm over snapshot
Wind26.5 C daytime highs
Need seed or starts?

Amazon affiliate link

Best window
After risk clears -> next window
Avoid
Today -> May 14, 2026
Night
3.5 C
Forecast low 3.5 C is at or below the crop cold threshold 15 C.
Heat
26.5 C
Watch the warmest afternoons after planting.
Rain
42 mm
Forecast highs remain below the crop heat threshold.
Crop fit
10 C minimum
Average air temperature is comfortably above the crop base temperature.
Forecast strip

Planting window

From
After risk clears
First possible planting day
30
days min
Minimum season needed for tomato to yield
Up to
next window
Last strong planting day
Estimated first yield
31 Jan 2026
Based on planting 1 Jan 2026 plus 30 minimum days for tomato.
Do this next
  1. 1Wait for the main risk to clear before sowing outside.
  2. 2Check overnight lows first if seedlings or warm-season crops are involved.
  3. 3Use this verdict as a field decision, not as a fixed calendar date.
Nearby decisions

What else can I plant near Genève, CH?