Safe to Plant

Laixi, Shandong, China

Frost dates for Laixi

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

8 April

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

Median first autumn frost

10 November

The far end of the outdoor season.

Frost-free season

216 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 28 Mar 8 Apr 16 Apr 22 Mar 25 Apr
First of autumn 27 Oct 10 Nov 17 Nov 17 Oct 21 Nov
Frost-free days 234 216 194 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 22 Mar 31 Mar 7 Apr 13 Mar 15 Apr
First of autumn 2 Nov 16 Nov 27 Nov 31 Oct 4 Dec
Frost-free days 251 231 209 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 6 Mar 18 Mar 26 Mar 17 Feb 4 Apr
First of autumn 23 Nov 30 Nov 12 Dec 3 Nov 20 Dec
Frost-free days 281 258 241 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

J
F
M
A
M
J
J
A
S
O
N
D

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 -6.9°C 2.7°C 30.5
February -5.1°C 5.9°C 27.1
March -1.1°C 12.8°C 20.2
April 5°C 20.2°C 2.9
May 11.4°C 26.8°C 0
June 17.2°C 31.2°C 0
July 21.4°C 32.1°C 0
August 20.9°C 30.4°C 0
September 15.5°C 26.9°C 0
October 8.5°C 20.7°C 0.4
November 1.3°C 12.4°C 12.6
December -4.3°C 4.6°C 29.1

Turn these dates into a planting calendar →