Free
$0
- This week, the year calendar and all 34 vegetable pages
- Frost odds at three levels of risk
- A Garden Book with 8 plantings a season, this year and next
A vegetable-garden calendar for Garfield Heights backyards
Plant by the odds.
Seed Clock turns thirty years of NOAA freeze records into planting dates for 34 vegetables. Choose how much frost risk you will take, and every date on the site moves with you.
Frost odds · chance of a freezing night after your spring date
At usual odds (3 in 10) the last spring frost is Apr 27 and the first fall frost Oct 30, from the Cleveland Hopkins record, about 13 miles west.
Frost risk Open season Today
This week · Sunday, November 1
The 2026 planting season has closed.
Nothing on the list can still be planted this year at usual odds. These are the first windows of 2027: a good week to plan them in a Garden Book.
- Broccoli Start indoors Jan 19 – Jun 12 Opens in 79 days
- Brussels sprouts Start indoors Jan 19 – Apr 6 Opens in 79 days
- Cabbage Start indoors Jan 19 – Jun 19 Opens in 79 days
- Celery Start indoors Jan 26 – Apr 10 Opens in 86 days
- Kohlrabi Spring · Start indoors Jan 26 – Mar 30 Opens in 86 days
- Eggplant Start indoors Feb 9 – Jun 12 Opens in 100 days
How the clock reads the weather record
One spring, three honest dates.
There is no single "last frost date". There is a spread of years. From 1991 to 2020 at Cleveland Hopkins, the last 32°F night of spring came…
- Bold Apr 20 later than this in 1 in 2 springs Plant on the middle date: in half of springs a freezing night still comes later.
- Usual Apr 27 later than this in 3 in 10 springs The in-between choice and our default: a later freezing night in about 3 springs out of 10.
- Careful May 5 later than this in 1 in 10 springs Wait for the safe side: a later freezing night in about 1 spring out of 10.
The Garden Book
Your plan, checked against the odds.
Add what you mean to grow and when. Seed Clock tells you if the date sits inside the planting window or before it, when the first harvest could come, and warns when a frost-tender crop would still be ripening after the first fall frost.
- No account and no email: a private link is the key.
- Record what really happened: started indoors, planted, first harvest.
- Free for 8 plantings a season; Plus holds 120 and keeps every season.
PeasMar 20 · Inside the planting window
First harvest May 14
TomatoMay 10 · Inside the planting window
First harvest Jul 19
EggplantJul 15 · Inside the planting window
First harvest Aug 14
Pricing
Free to plan. $1.95 to keep every season.
Free during preview Payments are not switched on yet: every Plus feature is open to everyone and nothing is charged.
Seed Clock Plus
$1.95/month or $19.50/year
- Up to 120 plantings a season in your Garden Book (free: 8)
- Every past season kept and open, so you can see what you planted when, year after year
- Your plan as a calendar file (.ics): indoor starts, planting days and expected first harvests in your phone's calendar
- The printable season wall chart and a CSV export of your Garden Book
Free during preview Every Plus feature is open now; nothing is charged.
Use Plus free during previewGood questions
Why Cleveland Hopkins, not Garfield Heights?
NOAA publishes freeze odds for stations with a long, checked record. Cleveland Hopkins International Airport has one (1991-2020) and is about 13 miles west. Garfield Heights has no such station, so we say exactly where the numbers come from. Low spots and valleys can frost later than the record; hilltops and city lots can frost earlier.
Where do the planting rules come from?
From Montana State University Extension's guide "Can I Grow That Here?" (MontGuide MT199308AG). The guide was written for Montana gardens. It writes every rule relative to the last spring frost and first fall frost ("1 week before last frost to 12 weeks before first frost"), and Seed Clock counts those weeks from Cleveland Hopkins frost dates instead of Montana ones. Soil, rain and varieties differ here, so for Ohio-specific growing advice see Ohio State University Extension (ohioline.osu.edu). How we read the guide.
Is this the City's garden program?
No. Seed Clock is an independent garden tool, not affiliated with the City of Garfield Heights or any government office.
What does "Free during preview" mean?
Payments are not switched on yet. Until they are, everything in Seed Clock Plus is open to everyone and nothing is charged. When payments start, the free Garden Book keeps 8 plantings a season and Plus is $1.95 a month or $19.50 a year, cancel any time.