What Grows in Rock Island Arsenal, Illinois

The last hard freeze (28°F) in Rock Island Arsenal typically lands around Apr 8, 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 29.

The first hard freeze (28°F) in Rock Island Arsenal typically arrives around Oct 29, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 15, so the watching starts about Sep 29 — about 204 days after the spring freeze cleared.

Measured between 28°F hard freezes, Rock Island Arsenal sees about 204 frost-free days — roughly Apr 8 through Oct 29, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 29 to Oct 15, about 169 days.

The federal record around Rock Island Arsenal is a meaningful one — 1,357 documented sites, mostly Underground Storage Tanks entries (789), the nearest Brownfields 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 Sep 29 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 Oct 29 (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 Oct 29. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.