Planning my first real garden this year and I keep seeing different advice on when to start tomatoes inside. How do I figure out the right timing for where I live so I’m not starting them way too early or too late?
Great question, and the fact that you’re planning before the seeds are in the ground puts you ahead of a lot of first-timers!
Here’s the simple way to work it out:
Start with your last frost date. That’s the anchor for everything. If you don’t know yours, just search “last frost date” plus your zip code or nearest town — almanac sites and your local extension office both list them.
Count back 6–8 weeks from that date. That’s your tomato starting window. Most varieties need that long to get to a sturdy transplant size. If you start much earlier, you end up with tall, leggy plants getting rootbound in pots while you’re still waiting on the weather.
Add a week or two buffer before transplanting. Tomatoes go out after your last frost, not on it — and they’ll do better if you’ve hardened them off first (setting them outside in a sheltered spot for a bit longer each day over about a week before they move out for good).
So as a rough example: if your last frost is May 15, count back 6–8 weeks and you’re looking at late March to early April for starting seeds.
A couple of things that’ll shift your timing:
- Variety — some are 60-day, some are 85-day. Longer-season varieties sometimes benefit from starting on the earlier end of that window.
- Your setup — strong grow lights let you push a little earlier without getting leggy plants. A sunny windowsill is workable but watch for stretching.
One more tip: your local cooperative extension office is a goldmine for region-specific advice. They often publish planting calendars tailored right to your county.
You’re going to do great. First garden is always a big learning year, but tomatoes are very forgiving. What part of the country are you in? Happy to help you think it through more specifically.