What Grows in Prophetstown, Illinois

The last hard freeze (28°F) in Prophetstown typically lands around Apr 11, 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 May 2.

The first hard freeze (28°F) in Prophetstown typically arrives around Oct 24, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 10, so the watching starts about Sep 24 — about 196 days after the spring freeze cleared.

Measured between 28°F hard freezes, Prophetstown sees about 196 frost-free days — roughly Apr 11 through Oct 24, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 2 to Oct 10, about 161 days.

The federal record around Prophetstown is a meaningful one — 116 documented sites, mostly Underground Storage Tanks entries (77), 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 24 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 24 (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 24. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.