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publish: storm-lake-field-guide
2026-07-18 04:41:23 +02:00
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Storm Lake Field Guide | Root Crops of Zone 5b</title>
<style>
:root {
--midnight: #0c0f1a;
--plowsteel: #2d3a4f;
--wheatgold: #f4e8c8;
--loam: #8b7355;
--frostline: #e8f4ff;
--canola: #fdd835;
--rootwhite: #d4cfbc;
--deepred: #8b2323;
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</style>
</head>
<body>
<header>
<h1>FIELD GUIDE</h1>
<div class="subtitle">ROOT CROPS OF STORM LAKE — USDA ZONE 5B</div>
<div style="margin-top: 2em; color: var(--loam);">
<a href="/" class="home-link">← BACK TO OPERATIONS</a>
</div>
</header>
<main>
<div class="intro">
<p>The frost date in Story County falls on October 15th, give or take three days depending on the chinook winds off the Missouri. This guide does not teach hope. It teaches timing.</p>
<p>Each section below names a root crop that survives the freeze, lists the exact window for sowing, and marks the depth at which the taproot finds shelter. These numbers come from forty years of Iowa State Extension bulletins and the ledgers kept by farmers whose names are carved into the churchyard stones along Highway 18.</p>
</div>
<section class="crop-section" id="turnip">
<h2>WINTER TURNIP (Brassica rapa var. rapa)</h2>
<img src="https://pixabay.com/get/g8fead0217b138e1bdc85d98304ff618dc25ee2b10df110baad55361e504494a5d6b7dfa36b98b24a660c4cb151b4e3914132328b483f77cdc52504f807d3277f_1280.jpg"
alt="White turnips with root systems exposed, showing the taproot geometry"
class="field-image">
<div class="spec-grid">
<div class="spec-label">PLANTING WINDOW</div>
<div class="spec-value">August 10 – September 5</div>
<div class="spec-label">SOIL TEMP AT SOW</div>
<div class="spec-value">14–18°C (57–64°F)</div>
<div class="spec-label">ROOT DEPTH</div>
<div class="spec-value">25–35 cm below surface</div>
<div class="spec-label">FROST TOLERANCE</div>
<div class="spec-value">−8°C crown survival</div>
<div class="spec-label">DAYS TO HARVEST</div>
<div class="spec-value">55–65 days</div>
<div class="spec-label">CROWD SPACING</div>
<div class="spec-value">15 cm between plants</div>
</div>
<div class="harvest-window">
<h3>HARVEST PROTOCOL</h3>
<p>Lift before the first hard freeze (−12°C). Store in sand at 0°C with 95% humidity. The turnip will sweeten in storage as starch converts to sucrose — a survival mechanism you can use.</p>
</div>
<div class="citation">
Source: <a href="https://extension.iastate.edu/plant-health/diagnostic-services/brassica-varieties" target="_blank">Iowa State University Extension — Brassica Cultivar Trials</a> · Q905795
</div>
</section>
<section class="crop-section" id="carrot">
<h2>HEIRLOOM CARROT (Daucus carota subs. sativus)</h2>
<img src="https://images.pexels.com/photos/36680345/pexels-photo-36680345.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=650&w=940"
alt="Snow-dusted field rows showing the buried geometry of root vegetables"
class="field-image">
<div class="spec-grid">
<div class="spec-label">PLANTING WINDOW</div>
<div class="spec-value">April 15 – May 10 OR August 1–20</div>
<div class="spec-label">SOIL TEMP AT SOW</div>
<div class="spec-value">7–12°C (45–54°F)</div>
<div class="spec-label">ROOT DEPTH</div>
<div class="spec-value">40–60 cm below surface</div>
<div class="spec-label">FROST TOLERANCE</div>
<div class="spec-value">−5°C with mulch protection</div>
<div class="spec-label">DAYS TO HARVEST</div>
<div class="spec-value">70–90 days</div>
<div class="spec-label">OVERWINTER VIABILITY</div>
<div class="spec-value">Yes — under 30cm straw</div>
</div>
<div class="harvest-window">
<h3>HARVEST PROTOCOL</h3>
<p>Leave in ground under heavy straw mulch. Harvest through January as needed. The cold converts glucose to raffinose — sweetness increases with temperature drop. Pull only what you will use within 48 hours.</p>
</div>
<div class="citation">
Source: <a href="https://naldc.nal.usda.gov/catalog?page=1&q=carrot+zone+5b" target="_blank">USDA NALDC — Carrot Varietal Performance Zone 5b</a>
</div>
</section>
<section class="crop-section" id="parsnip">
<h2>PARSNIP (Pastinaca sativa)</h2>
<div class="spec-grid">
<div class="spec-label">PLANTING WINDOW</div>
<div class="spec-value">March 25 – April 10</div>
<div class="spec-label">SOIL TEMP AT SOW</div>
<div class="spec-value">5–10°C (41–50°F)</div>
<div class="spec-label">ROOT DEPTH</div>
<div class="spec-value">50–75 cm below surface</div>
<div class="spec-label">FROST TOLERANCE</div>
<div class="spec-value">−15°C with snow cover</div>
<div class="spec-label">DAYS TO HARVEST</div>
<div class="spec-value">120–140 days</div>
<div class="spec-label">PREFERS</div>
<div class="spec-value">Loam over clay</div>
</div>
<div class="harvest-window">
<h3>HARVEST PROTOCOL</h3>
<p>Do not harvest before November 1. The parsnip requires three hard frosts to convert bitter compounds to sugars. Mark the row — you will dig in February.</p>
</div>
<div class="citation">
Source: <a href="https://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1034&context=horticulturefacpub" target="_blank">University of Nebraska — Root Crop Cold Acclimation</a>
</div>
</section>
<footer>
<p>Built from the loam of Story County, Iowa · Zone 5b frost date October 15 ±3 days</p>
<p><span class="data-twin">COMPANION: <a href="/field-guide.json" style="color:#a8d5e8">field-guide.json</a></span></p>
<p>© 2026 Barbara Cintron — Storm Lake Operations</p>
</footer>
</main>
</body>
</html>
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