Why July is secretly fall-planting month

Nobody wants to think about fall in July. The tomatoes are finally coming in, the hose lives in your hand, and the last thing that feels reasonable is starting more seeds. But the fall garden isn't planted in fall. It's planted now, while you're sweating, because everything in it is counted backward from the first frost — and the slow growers need a long enough runway to get there before the cold shuts them down.

That's the whole trick of fall planting: work backward. Pick your first frost date, then count back the number of weeks each crop needs to reach transplant size or harvest size before the cold arrives. Broccoli is the extreme case — it wants its seeds started indoors a full 15 weeks before that fall frost, then transplanted out at 10 weeks before frost, so it has a real head of time to size up before short days and cold slow it to a crawl. Carrots are more forgiving: direct-sow them 12 weeks before your fall frost date and they'll size up right on schedule, no transplanting fuss. Beets split the difference — sow direct at 10 weeks before frost, and if you want more, the window supports two more sowings roughly two weeks apart behind that.

The mistake almost everyone makes is waiting for it to feel like fall before they plant a fall garden. By the time the air actually cools off, broccoli started that week is chasing a frost date it can't catch, and carrots sown that late come up spindly and small before the ground goes cold. The count-back math doesn't care how the weather feels in July — it only cares about how many weeks a crop needs and how many weeks are actually left. Plant on the calendar's schedule, not the thermometer's.

There's a real upside to starting now, too: soil is warm, germination is fast, and you're not fighting cold, slow-sprouting seed the way you do in early spring. Fall crops planted in summer heat often come up faster and stronger than their spring counterparts did.

So this week, before the tomatoes distract you further: figure out your zone's fall frost date, and check whether your broccoli, carrots, or beets windows are open right now. The calendar does the counting for you — open it and see exactly what's due this week for your zone.