Planting Calendar Calculator
Every planting date in the garden hangs off two numbers: your average last spring frost and your average first autumn frost. Pick your hemisphere or a nearby city, choose a crop, and this calculator maps out when to start seeds indoors, when to move them outside, when to sow directly and when you can expect to be picking — laid out on a twelve-month bar you can read at a glance.
Your garden
Average last spring frost: Apr 15 · Average first autumn frost: Oct 25
Results
Frost-free season
193days
Days to maturity
75days
Frost tolerance
Frost-tender
Killed by the lightest frost — wait until the soil has warmed up.
Your twelve-month plan
- Sow indoorsMar 4 – Mar 18
- Transplant outApr 29 – May 20
- HarvestJul 13 – Sep 7
- Start this crop under cover — it needs a head start on the season.
Figures are typical averages. Your cultivar, soil and microclimate will shift them, so treat the results as a starting point.
How it works
- 1
Choose your region, or type in the last and first frost dates you already know for your garden.
- 2
Pick a crop from the built-in list of common vegetables and herbs, each carrying its usual days to maturity and frost tolerance.
- 3
The calculator counts backwards and forwards from your last frost: indoor sowing weeks before it, transplanting a set number of weeks after it, and harvest once the crop's days to maturity have elapsed.
- 4
Frost-tender crops have their harvest window closed off at your first autumn frost, so you can see immediately whether the season is long enough.
Frequently asked questions
Save this plan to your garden
Create a free Vegarden account and turn this result into sowing reminders, watering schedules and a harvest log you can come back to.
- Free
- Instant results
Related tools
Other free calculators that pair well with this one.
Frost Date Lookup
Find your growing season length and the earliest safe planting date for each hardiness group.
Open toolSeed Quantity Calculator
Turn a bed size and crop spacing into plant counts, rows and the number of seeds to buy.
Open toolSunlight Calculator
Turn the hours of direct sun on your balcony or bed into a light category and a crop shortlist.
Open tool