The last frost date your garden actually gets.
Most garden apps read your last frost off a map. Maythorn reads it from the weather station nearest you, out of 30 years of daily records, and tells you which station and how far away it is. Then it keeps the season journal you are currently keeping on paper.
€19.99 once. No subscription, no account, Family Sharing on.
Sow when it is safe where you are, not where the seed packet is.
A coastal station and an inland one can sit seven weeks apart. That gap is the whole reason this app exists.
The frost window, with its source
The median last spring frost, the one-in-ten-year late frost that careful gardeners plan against, and the first night warm enough for tomatoes and beans. The station name and its distance stay on screen, so you can judge the number yourself.
A season journal that remembers
Sowed, potted on, planted out, harvested, per bed or per plant. Every past season stays, so you can put this March beside last March instead of trusting memory.
Perennials and fruit trees too
Rhubarb, asparagus, apple, blackcurrant. The plants that stay in the ground for years, kept beside the annual beds instead of in a second notebook.
See it the way you will use it.
Free to start with one garden, this season's journal and the full frost window. One purchase opens the rest.
- Unlimited gardens and beds
- Every past season, compared year on year
- Perennials and fruit trees
- Export stays free in both
- Family Sharing
Questions people ask first.
Where do the frost dates come from?
From the national weather services: 30 years of daily minimum temperatures per station, turned into the median last frost, the one-in-ten-year date and the first warm nights. Every station is credited in the app with its licence. Nothing is estimated between stations, which is why the app shows you the distance and lets you disagree with it.
Is my country covered?
Nineteen are: the Netherlands, Belgium, Germany, Austria, Switzerland, France, the United Kingdom, Ireland, Spain, Poland, Czechia, Sweden, Norway, Denmark, Finland, the United States, Canada, Japan and South Korea. Where a country's records are not open for this, Italy and Mexico today, the app says so instead of showing a date it cannot stand behind. The journal, the crop catalogue, the export and your garden's own frost record work everywhere.
What if my garden sits between two stations?
You see which one it used and how far away it is, and you can pick a different one. On top of that, logging the frost nights you actually get builds your plot's own measured record, which beats any station once you have a few seasons in it.
Is it a subscription?
No. One purchase, €19.99, with Family Sharing. The free version is a real version: one garden, this season's journal, the full frost window, and export.
Can I get my data out?
Yes, in both the free and the paid version. Your whole garden exports as a file whenever you want it.