What Grows in Rock Hill, Missouri

The last hard freeze (28°F) in Rock Hill typically lands around Mar 21, per NOAA 1991–2020 climate normals — earlier than the light-frost dates most charts quote. That marks the hard freeze, not the last light frost — lighter frosts keep biting past it, which is why tender transplants here wait until about Apr 11.

The first hard freeze (28°F) in Rock Hill typically arrives around Nov 17, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 3, so the watching starts about Oct 18 — about 241 days after the spring freeze cleared.

Measured between 28°F hard freezes, Rock Hill sees about 241 frost-free days — roughly Mar 21 through Nov 17, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 11 to Nov 3, about 206 days.

The federal record around Rock Hill is a meaningful one — 4,306 documented sites, mostly Underground Storage Tanks entries (2,616), the nearest Underground Storage Tanks record under a tenth of a mile out — so a soil test before new food beds is a sensible precaution here, not a reason to hold back from growing. Remember that proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what sits where.

From about Oct 18 the job here turns from planting to protecting — the last start even a 30-day crop can finish. As the season closes around the first 28°F hard freeze near Nov 17 (NOAA 1991–2020 climate normals), three moves buy time: row cover or an old sheet over tender plants on still, clear nights; water the soil the afternoon before a freeze, so it holds warmth overnight; and harvest tomatoes, peppers and basil before Nov 17. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.