Frost Dates for Heathrow, United Kingdom

Frost Dates

Last Spring Frost (50%) iA 50% chance that the last spring frost has already passed by this date. Most gardeners use this as their primary planting guide. March 27
First Fall Frost (50%) iA 50% chance that the first fall frost has occurred by this date. Plan to harvest or protect tender plants before this date. November 15
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

30% Probability iOnly 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 6
First Fall Frost November 6

Hard Freeze (28°F / -2°C)

Last Spring Hard Freeze February 19
First Fall Hard Freeze December 6
51.48°N, 0.45°W © OpenStreetMap

Growing Season

233 Days March 27 to November 15

USDA Hardiness Zone iHardiness 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 9a

Learn more

Temperature

30° 50° 70°
42°
High: 47°
Avg: 42°
Low: 37°
Jan
43°
High: 48°
Avg: 43°
Low: 37°
Feb
46°
High: 53°
Avg: 46°
Low: 40°
Mar
51°
High: 59°
Avg: 51°
Low: 43°
Apr
57°
High: 65°
Avg: 57°
Low: 48°
May
62°
High: 71°
Avg: 62°
Low: 54°
Jun
66°
High: 75°
Avg: 66°
Low: 58°
Jul
66°
High: 74°
Avg: 66°
Low: 57°
Aug
61°
High: 68°
Avg: 61°
Low: 53°
Sep
54°
High: 60°
Avg: 54°
Low: 48°
Oct
47°
High: 52°
Avg: 47°
Low: 42°
Nov
43°
High: 48°
Avg: 43°
Low: 38°
Dec
32°F
Avg High Avg Temp Avg Low Light Frost (32°F)

Precipitation

0" 1" 2" 2.8"
2.6"
2.60"
Jan
2.2"
2.20"
Feb
1.2"
1.20"
Mar
1.5"
1.50"
Apr
1.8"
1.80"
May
1.9"
1.90"
Jun
1.5"
1.50"
Jul
1.9"
1.90"
Aug
1.8"
1.80"
Sep
2.7"
2.70"
Oct
2.8"
2.80"
Nov
2.5"
2.50"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec8h10h12h14h15h16h16h14h12h10h9h8h
Jan: 7:57 AM – 4:03 PM · 8h 06m
Feb: 7:09 AM – 4:51 PM · 9h 42m
Mar: 6:14 AM – 5:46 PM · 11h 32m
Apr: 5:12 AM – 6:48 PM · 13h 36m
May: 4:19 AM – 7:41 PM · 15h 22m
Jun: 3:49 AM – 8:11 PM · 16h 22m
Jul: 4:01 AM – 7:59 PM · 15h 58m
Aug: 4:48 AM – 7:12 PM · 14h 24m
Sep: 5:49 AM – 6:11 PM · 12h 22m
Oct: 6:49 AM – 5:11 PM · 10h 22m
Nov: 7:43 AM – 4:17 PM · 8h 33m
Dec: 8:11 AM – 3:49 PM · 7h 37m
Daylight Longest: 16h 24m · Shortest: 7h 36m

Nearby Stations

Wisley, United Kingdom April 26 - October 25 Hampstead, United Kingdom March 31 - November 18 Writtle, United Kingdom April 28 - October 23 Rothamsted, United Kingdom April 16 - November 8 Alice Holt Lodge, United Kingdom April 30 - October 23 Goudhurst, United Kingdom April 28 - November 5

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