Frost Dates for BIRR, Ireland

Elevation: 59 m

Frost Dates

Last Spring Frost (50%) A 50% chance that the last spring frost has already passed by this date. Most gardeners use this as their primary planting guide. March 29
First Fall Frost (50%) A 50% chance that the first fall frost has occurred by this date. Plan to harvest or protect tender plants before this date. November 21

30% Probability

Only a 30% chance of frost remaining by this date. Use these dates for a safer planting window, especially for tender plants sensitive to cold.
Last Spring Frost April 9
First Fall Frost November 11

Hard Freeze (−2°C)

Last Spring Hard Freeze February 14
First Fall Hard Freeze December 10
53.09°N, 7.88°W © OpenStreetMap

Growing Season

237 Days March 29 to November 21

USDA Hardiness Zone

Hardiness zones indicate which perennial plants can survive winter in your area. For annual vegetables, frost dates and growing season length matter more than hardiness zone.
Zone 9b

Avg. annual minimum: −4 to −1°C

Learn more

Köppen Climate

The Köppen climate classification system categorizes climates based on temperature and precipitation patterns.
Cfb Oceanic (Marine West Coast)

Mild year-round with cool summers and wet winters. Excellent for cool-season crops like brassicas, peas, and root vegetables. Extended harvest seasons but summer heat-loving crops may struggle.

Köppen climate map

Temperature

Avg High Avg Temp Avg Low
Temperature table
Average monthly temperatures (°C)
Month Avg High Avg Temp Avg Low
January8°5°3°
February8°5°3°
March10°7°4°
April12°9°5°
May15°11°8°
June17°14°10°
July19°15°12°
August18°15°12°
September16°13°10°
October13°10°8°
November10°7°5°
December8°6°3°

Precipitation

Precipitation table
Average monthly precipitation (millimeters)
MonthPrecipitation
January81
February71
March76
April74
May79
June76
July79
August81
September76
October86
November89
December94

Sunrise / Sunset

Daylight Longest: 16h 42m · Shortest: 7h 18m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (local solar time)
Month Sunrise Sunset Daylight
January8:05 AM3:55 PM7h 50m
February7:13 AM4:47 PM9h 33m
March6:15 AM5:45 PM11h 30m
April5:09 AM6:51 PM13h 42m
May4:12 AM7:48 PM15h 36m
June3:40 AM8:20 PM16h 40m
July3:53 AM8:07 PM16h 13m
August4:44 AM7:16 PM14h 33m
September5:48 AM6:12 PM12h 24m
October6:52 AM5:08 PM10h 16m
November7:50 AM4:10 PM8h 20m
December8:20 AM3:40 PM7h 20m

Nearby Stations

CASEMENT, Ireland March 22 - November 20 WATERFORD (TYCOR), Ireland March 1 - December 3 DUBLIN PHOENIX PARK, Ireland March 15 - December 4 CONNAUGHT, Ireland April 1 - November 17 Lough Navar Forest, United Kingdom May 23 - October 3 BALLYSHANNON (CATHLEENS FALL), Ireland March 21 - November 25

Plan Your Garden with Planter

Now that you know your frost dates, use Planter to plan your veggie garden! Planter is an easy drag-and-drop garden planner with personalized planting schedules.

Try Planter For Free

Available everywhere: iOS, Android, web, and more!

Planter app garden planner preview