Safe to Plant

Baiyin, Gansu, China

Frost dates for Baiyin

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

21 April

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

Median first autumn frost

15 October

The far end of the outdoor season.

Frost-free season

177 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 9 Apr 21 Apr 12 May 29 Mar 18 May
First of autumn 6 Oct 15 Oct 28 Oct 20 Sep 1 Nov
Frost-free days 202 177 147 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 27 Mar 12 Apr 26 Apr 22 Mar 5 May
First of autumn 14 Oct 26 Oct 5 Nov 1 Oct 13 Nov
Frost-free days 223 197 171 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 11 Mar 27 Mar 11 Apr 1 Mar 16 Apr
First of autumn 25 Oct 6 Nov 21 Nov 23 Oct 27 Nov
Frost-free days 255 224 197 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 -10.7°C 1.1°C 31
February -7.2°C 4.9°C 28.2
March -2.7°C 11.3°C 25.9
April 2.3°C 17.7°C 7.9
May 7.9°C 22.8°C 0.2
June 12.9°C 27.2°C 0
July 15.4°C 29.4°C 0
August 14.4°C 28°C 0
September 9.6°C 23°C 0.1
October 3.1°C 16.6°C 5.8
November -3.5°C 9°C 26.6
December -9.1°C 2.3°C 31

Turn these dates into a planting calendar →

Nearby

Compare with places close by

Lanzhou Zone 6b 62 km Last frost 30 Apr First 15 Oct Dingxi Zone 6b 116 km Last frost 1 May First 11 Oct Linxia Chengguanzhen Zone 7a 136 km Last frost 12 May First 7 Oct Zhongwei Zone 6b 140 km Last frost 20 Apr First 16 Oct Nianbo Zone 6b 157 km Last frost 20 May First 1 Oct Guyuan Zone 6b 199 km Last frost 27 Apr First 12 Oct Wuwei Zone 6b 205 km Last frost 24 Apr First 13 Oct Xining Zone 6b 216 km Last frost 17 May First 2 Oct