Frost dates
Frost in Wales
What the stations recorded, 1996 to 2025
- Cardiff (Bute Park) (9 m): 1.4 air frost days on average in April and 0 in May; 0.7 in October and 3.8 in November. April is the last spring month averaging half a frosty day or more, and October the first autumn one. About 33 frosty days a year.
- Valley (Anglesey) (10 m): 0.6 air frost days on average in April and 0 in May; 0.1 in October and 0.7 in November. April is the last spring month averaging half a frosty day or more, and November the first autumn one. About 17 frosty days a year.
- Aberporth (133 m): 0.3 air frost days on average in April and 0 in May; 0 in October and 0.5 in November. March is the last spring month averaging half a frosty day or more, and November the first autumn one. About 13 frosty days a year.
Three coastal or near-coastal stations: Cardiff's Bute Park, Valley on Anglesey, and Aberporth on the Ceredigion coast. Inland Wales is higher and colder than all three.
Your own garden
A station is one spot. Add your postcode for your area's average last and first frost.
Month by month
| Station | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cardiff (Bute Park) | 8.9 | 7.0 | 3.8 | 1.4 | 0 | 0 | 0 | 0 | 0 | 0.7 | 3.8 | 7.6 |
| Valley (Anglesey) | 5.0 | 4.2 | 2.7 | 0.6 | 0 | 0 | 0 | 0 | 0 | 0.1 | 0.7 | 3.7 |
| Aberporth | 4.2 | 3.3 | 1.8 | 0.3 | 0 | 0 | 0 | 0 | 0 | 0 | 0.5 | 3.2 |
What this means for sowing and planting
Anglesey and the Ceredigion coast average very few spring frosts and almost none after April. Cardiff's park station averages more than either, with frosts into April and again in October, which suggests open parkland can be cold even at sea level.
For coastal gardens, tender crops can often go out in late May. For the valleys and uplands, which these stations don't cover, June is the safer plan.
Local things that change it
Uplands
Most of inland Wales is far higher than any station here. Expect a longer frost season.Cardiff’s estimates
Some Cardiff months in the period are marked by the Met Office as estimated.Autumn broad beans
Mild coastal gardens are the kind the RHS has in mind for autumn sowing. See broad beans.Your garden
Use the postcode look-up above for your own area.
What we can and can't tell you
Stations, not your garden
These are thermometer readings at a handful of Met Office sites, averaged over thirty years. They show how the region behaves, not what your garden will do this spring. A frosty day count isn't a last-frost date, and a ground frost can come on a night the station records none. For your area's typical last frost and how late one can come, use the postcode look-up above.
Keep going
Where this comes from
Crop windows, growing times and plant families come from Vercro's own curated crop catalogue, the same data the Vercro app uses. Where a published source says something different, we show both rather than choosing the convenient one. Reviewed 19 September 2026.
- Historic station data (monthly air frost days, 1996 to 2025), Met Office, Open Government Licence v3.0. Read 19 September 2026.
- A touch of frost: types of frost, Royal Meteorological Society. Read 19 September 2026.
Vercro reads your garden's own frost dates
Add your garden's postcode and Vercro uses its frost dates to say whether a sowing will finish in time, and its forecast to shape the jobs it shows on Today.