Safe to Plant

Mainz, Rheinland-Pfalz, Germany

Frost dates for Mainz

The full distribution rather than a single date. Every figure below is a percentile of 30 years of daily minimum temperatures at this location, expressed as the date it fell on.

Median last spring frost

20 April

Half of years are later than this. Not a planting date.

Median first autumn frost

7 November

The far end of the outdoor season.

Frost-free season

201 days

Between those two dates in a median year.

Last and first frost by severity

Read a row as: in this fraction of years, the last frost of spring had already happened by this date. The 90% column is the cautious planting date; the 10% column is the gamble.

Light frost — nights at or below 0°C (32°F). Air temperature reaches freezing. Kills basil, beans and unhardened tomatoes; hardy crops shrug it off.
Frost 1 year in 10 Median 9 years in 10 Earliest Latest
Last of spring 7 Apr 20 Apr 4 May 1 Apr 13 May
First of autumn 15 Oct 7 Nov 19 Nov 12 Oct 5 Dec
Frost-free days 226 201 164 every year on record saw this
Moderate frost — nights at or below -2.2°C (28°F). Damages half-hardy plants and most blossom. This is the threshold that decides a fruit crop.
Frost 1 year in 10 Median 9 years in 10 Earliest Latest
Last of spring 18 Mar 6 Apr 20 Apr 8 Feb 24 Apr
First of autumn 22 Oct 17 Nov 6 Dec 15 Oct 27 Dec
Frost-free days 263 225 185 every year on record saw this
Hard frost — nights at or below -4.4°C (24.1°F). Ground freezes and even hardy crops check their growth. Effectively the end of the outdoor year.
Frost 1 year in 10 Median 9 years in 10 Earliest Latest
Last of spring 26 Jan 7 Mar 31 Mar 18 Jan 9 Apr
First of autumn 30 Oct 26 Nov 16 Dec 22 Oct 28 Dec
Frost-free days 324 265 213 every year on record saw this

Dates in the southern hemisphere are computed on a growing year that starts in July, which is why "last of spring" falls where it should rather than in the middle of the calendar.

Chance of frost, week by week

Jan Mar Apr Jul Sep Oct Dec
Chance of at least one air frost during each week of the year, measured across the full record. The flat stretch in the middle is your frost-free season.

Temperature through the year

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Mean monthly temperature across the record. Months shown in blue average at least one air frost.

Monthly means and average number of frost nights.
Month Mean low Mean high Frost nights
January -2.5°C 2.9°C 21.7
February -1.6°C 5.3°C 18.3
March 0.4°C 9.4°C 14
April 3.5°C 14.1°C 5.4
May 7.8°C 18.4°C 0.2
June 11.6°C 22.7°C 0
July 13.7°C 25.1°C 0
August 13.6°C 25.3°C 0
September 9.7°C 20.9°C 0
October 5.9°C 14.9°C 1.9
November 1.9°C 7.8°C 9.1
December -1.3°C 3.6°C 19.2

Turn these dates into a planting calendar →

Nearby

Compare with places close by

Wiesbaden Zone 8a 12 km Last frost 20 Apr First 7 Nov Frankfurt am Main Zone 8a 32 km Last frost 17 Apr First 7 Nov Mannheim Zone 8a 56 km Last frost 18 Apr First 6 Nov Karlsruhe Zone 8a 109 km Last frost 16 Apr First 8 Nov Bonn Zone 8a 119 km Last frost 21 Apr First 6 Nov Köln Zone 8a 142 km Last frost 17 Apr First 10 Nov Stuttgart Zone 7b 148 km Last frost 19 Apr First 3 Nov Strasbourg Zone 8a 160 km Last frost 15 Apr First 6 Nov