The only “state” rule I actually trust
If I try to follow a random “planting calendar by state,” I always end up confused—because states have multiple climates.
So I use the method that works everywhere:
- Find my average last frost date (for my ZIP code)
- Count backwards in weeks
- Start seeds indoors in the correct window
- Transplant when nights are warm enough (not just when the calendar says so)
This post gives me a week-by-week schedule I can use in any U.S. state—Florida, Texas, Michigan, Colorado, California… all of it.
Step 1: Write down my last frost date
Everything below is relative to that date.
- Last frost date: ________
- (Optional later) First frost date: ________
If I’m on a balcony or in a windy spot, I still use the frost date—but I’m more cautious with transplanting.
Step 2: Use this week-by-week seed starting schedule
Think of this as “how many weeks before last frost I should start seeds indoors.”
12–10 weeks before last frost
These are slow growers or plants I want big and strong early:
- Onions from seed (optional—many gardeners use sets instead)
- Leeks
- Slow herbs (if I’m doing them from seed): rosemary, thyme (they can be finicky)
If I’m new: I skip onion seed and buy sets. It saves time.
10–8 weeks before last frost
This is pepper season.
- Peppers (sweet + hot)
- Eggplant
- Celery (advanced, but doable)
Why so early? Peppers and eggplant grow slowly at first. If I start them late, they stay tiny all summer.
Pro tip: peppers germinate faster with warm soil (a warm spot or heat mat helps).
8–6 weeks before last frost
This is the “main event” window for many gardens.
- Tomatoes
- Basil (if I want early plants)
- Tomatillos
- Ground cherries (if I’m growing them)
Tomatoes started too early become tall and stressed in small pots. If I’m not ready to pot up, I’d rather start at 6 weeks instead of 8.
6–4 weeks before last frost
Cool-season transplants and fast indoor starts:
- Broccoli, cabbage, cauliflower, kale (brassicas)
- Lettuce (optional indoors; many direct sow instead)
- Chard
- Parsley (slow to germinate but worth it)
This is also a good time to start flowers that handle cool temps, depending on variety.
4–3 weeks before last frost
These are plants that grow fast and hate root disturbance if they sit too long:
- Cucumbers (if starting indoors)
- Squash / zucchini (if starting indoors)
- Melons (short indoor start)
Honestly, in many states it’s easier to direct sow these after frost—but starting indoors can help in shorter summers.
2–0 weeks before last frost
This is not usually about starting indoors—this is about preparing outdoors:
- Begin hardening off seedlings
- Direct sow early cool crops if soil is workable
- Get beds/containers ready
If I’m starting anything indoors this late, it’s usually a backup round of lettuce or herbs.
What NOT to start indoors (most of the time)
Some crops are happier direct sown:
- Carrots (hate transplanting)
- Radishes (super fast)
- Peas (direct sow in cool soil)
- Beans (direct sow when warm)
- Corn (direct sow)
I can start some of these indoors, but it’s usually extra work for little gain.
Step 3: Transplant timing (the part most calendars ignore)
A lot of beginners do everything right indoors—then lose plants outside because it’s still cold at night.
Here’s the simple guideline I follow:
- Tomatoes: transplant when nights are consistently around 50°F+
- Peppers/eggplant: better at 55°F+
- Cucumbers/squash: they want warm soil and warm nights
If my state has late cold snaps (hello, Midwest and mountain states), I keep an easy protection plan:
- bring pots closer to the house wall
- use frost cloth
- delay transplanting a week instead of risking stress
Balcony container note (super important)
On a balcony:
- pots warm up faster in sun
- but wind can chill plants and dry them quickly
So my timeline stays the same—but I watch:
- wind + sun exposure
- how fast pots dry out
- nighttime temps near the balcony wall (often warmer than open yard)
Quick “cheat sheet” list (copy/paste)
Use this with your last frost date:
- Peppers / eggplant: 10–8 weeks before
- Tomatoes: 8–6 weeks before
- Broccoli / cabbage / kale: 6–4 weeks before
- Lettuce / parsley: 6–4 weeks before
- Cucumbers / squash (optional): 4–3 weeks before
- Hardening off: start 10 days before transplant
If I’m late: my “save the season” plan
Being late isn’t a disaster. I do this:
- Start fast crops now (lettuce, herbs, beans later)
- Buy starts for slow crops (peppers especially)
- Choose varieties that mature faster:
- “early” tomatoes
- compact bush varieties
- quick greens
If I only buy one type of transplant, it’s peppers—they’re the hardest to catch up.
Common timing mistakes (and the fix)
Mistake 1: Starting everything at the same time
Fix: start by weeks, not vibes. Peppers first, tomatoes later.
Mistake 2: Starting tomatoes too early
Fix: start tomatoes 6 weeks before frost if I don’t want to pot up.
Mistake 3: Transplanting based on the calendar only
Fix: check night temps. Cold nights = slow growth and stress.
FAQ
Do I need grow lights?
If I’m starting early indoors, yes—lights prevent leggy seedlings. A bright window alone often isn’t enough.
Can I start cucumbers indoors?
Yes, but only for a short window (3–4 weeks). If they sit too long, they get cranky.
What if my state is huge and varied?
Ignore the state and use your ZIP-code frost date. That’s the real calendar.