Safe to Plant

Yangju, Gyeonggi-do, South Korea

Frost dates for Yangju

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

12 April

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

Median first autumn frost

27 October

The far end of the outdoor season.

Frost-free season

198 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 3 Apr 12 Apr 23 Apr 2 Apr 25 Apr
First of autumn 17 Oct 27 Oct 6 Nov 12 Oct 7 Nov
Frost-free days 217 198 177 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 2 Apr 15 Apr 16 Mar 20 Apr
First of autumn 26 Oct 2 Nov 13 Nov 17 Oct 18 Nov
Frost-free days 236 215 194 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 3 Mar 23 Mar 3 Apr 21 Feb 12 Apr
First of autumn 2 Nov 15 Nov 25 Nov 28 Oct 6 Dec
Frost-free days 267 238 213 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

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 -0.4°C 30.6
February -7.5°C 3°C 27.5
March -2.2°C 9.3°C 24
April 3.5°C 16.4°C 5.5
May 9.8°C 22.4°C 0
June 15.9°C 27°C 0
July 20.2°C 28.2°C 0
August 20.6°C 28.2°C 0
September 14.8°C 24.1°C 0
October 6.9°C 17.9°C 2.1
November -0.3°C 9.6°C 16.2
December -7.9°C 1.4°C 30

Turn these dates into a planting calendar →

Nearby

Compare with places close by

Uijeongbu-si Zone 7a 10 km Last frost 3 Apr First 12 Nov Guri-si Zone 7a 27 km Last frost 3 Apr First 12 Nov Goyang-si Zone 7a 28 km Last frost 3 Apr First 12 Nov Seoul Zone 7a 31 km Last frost 3 Apr First 12 Nov Hanam Zone 6b 35 km Last frost 12 Apr First 28 Oct Gimpo-si Zone 7a 38 km Last frost 3 Apr First 12 Nov Gwangmyeong Zone 7a 43 km Last frost 3 Apr First 12 Nov Seongnam-si Zone 7a 44 km Last frost 3 Apr First 12 Nov