Risk dial
Will let you 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
Median dates from NOAA 1991–2020 climate normals. Averages, not forecasts. How it works
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
Planned: your garden plan, with reminders that will come to you.
We’re building a personal planting plan + calendar feed. Join the waitlist and we’ll send one note if and when it launches. Waitlist members get the first year at $15 if it does.
Planned, not built yet (none of these work today)
Calendar feed
Will let you subscribe in Google, Apple or Outlook calendar, so “Start tomatoes indoors” shows up on the right day.
My Garden plan
Will let you pick crops and varieties with their days to maturity, get succession sowings and harvest windows, and keep several gardens.
Notes and yearly log
Will let you jot “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 if Pro launches
- Everything in Free
- Planned: Risk dial
- Planned: iCal calendar feed
- Planned: My Garden plans + succession sowing
- Planned: 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.
Frost dates by city
Frost dates for big US cities
NOAA freeze dates and a ready-made planting calendar for each city. Your own ZIP is still the closest match.
- CO · zone 6a Denver Last frost ~Apr 30First frost ~Oct 12 165 frost-free days
- IL · zone 6b Chicago Last frost ~Apr 10First frost ~Nov 5 209 frost-free days
- WA · zone 9a Seattle Last frost ~Mar 13First frost ~Nov 17 249 frost-free days
- GA · zone 8a Atlanta Last frost ~Mar 24First frost ~Nov 8 229 frost-free days
- TX · zone 8a Dallas Last frost ~Mar 2First frost ~Nov 29 272 frost-free days
- MN · zone 4b Minneapolis Last frost ~Apr 23First frost ~Oct 16 176 frost-free days
- OR · zone 8b Portland Last frost ~Feb 25First frost ~Dec 1 279 frost-free days
- MA · zone 7a Boston Last frost ~Apr 4First frost ~Nov 9 219 frost-free days
- TN · zone 7a Nashville Last frost ~Apr 1First frost ~Oct 31 213 frost-free days
- UT · zone 7a Salt Lake City Last frost ~Mar 31First frost ~Nov 8 222 frost-free days
Straight answers
How FrostLine works
Where do the frost dates come from?
Your ZIP is matched to the nearest NOAA weather station with freeze records (we show its name and distance), and we use its median (50%) last spring and first fall 32°F dates from NOAA’s public-domain 1991–2020 U.S. Climate Normals. Distance is measured from the middle of your Census ZIP area. Elevation, valleys, cities and big water can still shift your real dates by one to three weeks, and we flag mountain areas and far-away stations 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. For ZIPs, the “safer” dates are NOAA’s 10% dates: only a 1-in-10 chance of a 32°F night after the spring date or before the fall date. For zones and your own dates, “safer” adds two weeks in spring and subtracts two in fall. 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. For ZIPs, warm-season crops also wait until the station’s normal night low (NOAA daily normals) reaches 50°F, or 45°F for squash, cucumbers, beans and corn, which holds them back in cool-spring places like Seattle. 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.