Risk dial
Go cautious or bold with your frost dates and watch the whole plan shift with you.
Free planting calendar · No signup
What to plant this week, right where you live.
Type your ZIP. Get your estimated frost dates and a color-coded calendar for 50+ vegetables, herbs and flowers: when to start seeds, sow, transplant and harvest.Type your ZIP. See your frost dates and when to sow, plant and harvest 50+ crops.
Runs in your browser. Your ZIP never leaves your device.
Example location
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Last spring frost
–
safer: –
First fall frost
–
safer: –
Growing season
–
frost-free days
- Start indoors
- Sow outside
- Transplant
- Fall planting
- Harvest
Estimated median dates from regional climate normals. Averages, not forecasts. How we estimate
This week
Right now in your garden
Full year
Your planting calendar
- Start indoors
- Sow outside
- Transplant
- Fall sowing / planting
- Harvest
- Harvest the season after planting
- Est. frost date
No crops match. Try another search, or clear “My picks”.
Tap ☆ to add a crop to your picks. Tap a crop name for exact dates and growing notes. Your picks and location are saved on this device.
FrostLine Pro
Your garden plan, with reminders that come to you.
Your personal planting plan + calendar feed launches mid-November, in time for seed-starting season. Join the waitlist for your first year at $15.
Calendar feed
Subscribe in Google, Apple or Outlook calendar. “Start tomatoes indoors” shows up on the right day.
My Garden plan
Pick crops and varieties with their days to maturity. Get succession sowings and harvest windows. Keep several gardens.
Notes and yearly log
“Tomatoes out May 2, frost May 9.” Copy last year’s plan forward and keep a simple bed list.
Free
$0
- ZIP, zone or your own frost dates
- 50+ crop calendar + this week view
- Print or save as PDF
- No account, ever
Pro yearly
$24 / year
Waitlist: first year $15
- Everything in Free
- Risk dial
- iCal calendar feed
- My Garden plans + succession sowing
- Notes and yearly log
Pro monthly
$4 / month
- Everything in Pro
- Cancel any time
Pro isn’t on sale yet. Joining the waitlist costs nothing and we’ll email you once when it launches.
Straight answers
How FrostLine works
Where do the frost dates come from?
Each 3-digit ZIP area maps to a hand-compiled estimate of the median (50%) last spring and first fall 32°F frost for a representative town, informed by NOAA’s public-domain 1991–2020 climate normals for nearby cities. It is not a live station lookup yet. Elevation, valleys, cities and big water can shift your real dates by one to three weeks, and we flag mountain areas where that is likely.
Are these forecasts?
No. They are long-term averages. In a typical year there is about a 50% chance of frost after the median spring date. The “safer” dates add two weeks in spring and subtract two in fall, a common rule of thumb for lower risk. Always check the 10-day forecast before setting out tender plants.
How are planting windows worked out?
Each crop has our own rules of thumb, written as weeks before or after your frost dates. For example, tomatoes are started indoors 6–8 weeks before the last frost and transplanted 1–4 weeks after it. Harvest windows add typical days to maturity. Seed packets and your local Cooperative Extension office know your varieties and soil best.
What about USDA zones?
Zones describe the coldest winter nights, not when frosts happen, so two gardens in the same zone can have very different seasons. Zone dates here are rough starting points. A ZIP or your own dates will be closer.
I’m outside the US, or frost is rare where I live
Use “enter your own frost dates”. In frost-free areas such as South Florida, coastal California or Hawaii, summer heat rather than frost limits the season, so treat this calendar as a rough cool-season guide.
What do you store?
Nothing, unless you join the waitlist. The calendar runs entirely in your browser and saves your location and picks only on this device. If you join the waitlist we keep your email, the plan you chose, your USDA zone (never your ZIP) and when you signed up. No newsletter, never shared or sold.