Istanbul, Istanbul, Turkey

Frost dates for Istanbul

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 February

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

Median first autumn frost

19 December

The far end of the outdoor season.

Frost-free season

303 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	25 Jan	20 Feb	18 Mar	13 Jan	10 Apr
First of autumn	5 Dec	19 Dec	26 Dec	23 Nov	27 Dec
Frost-free days	336	303	262	3 of 30 years saw none at all

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	10 Jan	4 Feb	26 Feb	9 Jan	12 Mar
First of autumn	19 Dec	20 Dec	20 Dec	19 Dec	20 Dec
Frost-free days	344	319	296	13 of 30 years saw none at all

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	7 Jan	9 Jan	7 Feb	7 Jan	14 Feb
First of autumn	—	—	—	—	—
Frost-free days	—	—	—	27 of 30 years saw none at all

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

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

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	3.7°C	8.4°C	4
February	4°C	9.3°C	2.6
March	5.3°C	11.4°C	0.8
April	8.8°C	15.8°C	0
May	13.6°C	21°C	0
June	18.5°C	25.8°C	0
July	21.4°C	28.9°C	0
August	22.1°C	29.1°C	0
September	18.8°C	25.2°C	0
October	14.3°C	19.9°C	0
November	9.9°C	15.2°C	0.1
December	6.1°C	10.6°C	0.8

Turn these dates into a planting calendar →

Nearby

Compare with places close by

Esenyurt Zone 9b 23 km Last frost 20 Feb First 19 Dec Bursa Zone 8a 91 km Last frost 4 Apr First 21 Nov Eskişehir Zone 7b 191 km Last frost 22 Apr First 2 Nov