I have received several requests for information concerning growing degree days (GDDs) available for late corn plantings. Table 1-1 in the OSU Agronomy Guide 14th  edition provides GDDs for various sites in May through the 10% probability date of the first frost (first occurrence of 32 degrees F) in the fall.  However, GDD accumulations based on a 10% probability of frost may be to “conservative” for use in selecting hybrids for delayed plantings, so we have provided a listing of GDDs available based on the 50% chance of frost occurrence in the fall (Table 1). Moreover this listing includes GDD accumulations through the 50% frost date for two June planting dates. The GDD accumulations  shown in Table 1 were determined by H.M. Keener and R.C. Hansen and reported in OARDC Research Circular 294 “Expected Yield for Corn in Ohio as a Function of Location and Planting Date”. The GDD values shown for the 89 Ohio locations are based on long term weather data (10-72 years).

Although there is a significant reduction in GDDs available for late planted corn compared to early planted corn, remember that GDD requirements for corn decrease by about 6.8 days for each day that planting was delayed. See this week’s C.O.R.N. article - “Will Planting Delays Require Earlier Maturing Corn Hybrids?” for more information on this topic.

Table 1.  Average growing degree day (GDD) accumulations for 6 planting dates from April 30 to June 19 for 89 Ohio locations (source: Keener and Hanson, 1992).

 

 

Accumulated GDD Means

 

April

 

May

 

June

Location

30

 

10

20

30

 

9

19

Akron-Canton

2779

 

2672

2540

2395

 

2198

1991

Ashland

2816

 

2705

2568

2409

 

2209

1996

Barnesville

2644

 

2529

2384

2222

 

2020

1814

Bellefontaine

2946

 

2829

2682

2511

 

2301

2078

Bowling Green

3010

 

2891

2746

2571

 

2358

2129

Bucyrus

2739

 

2625

2490

2326

 

2121

1908

Cadiz

2972

 

2847

2697

2522

 

2319

2097

Caldwell

3007

 

2875

2716

2539

 

2323

2100

Cambridge

2940

 

2807

2645

2463

 

2246

2020

Canfield

2587

 

2489

2365

2200

 

2016

1813

Carpenter

2965

 

2826

2654

2470

 

2246

2018

Castalia

2793

 

2687

2561

2413

 

2213

2015

Celina

3056

 

2927

2771

2601

 

2377

2159

Centerburg

2682

 

2560

2413

2256

 

2057

1858

Chardon

2644

 

2549

2429

2297

 

2114

1919

Charles Mill Dam

2497

 

2396

2267

2118

 

1930

1731

Chillicothe

3209

 

3069

2897

2706

 

2476

2238

Chilo Meldahl Dam

3293

 

3159

2985

2800

 

2572

2337

Chippewa-on-the-Lake

2687

 

2575

2439

2280

 

2085

1877

Cincinnati-Abbe

3435

 

3300

3136

2932

 

2706

2454

Circleville

3179

 

3041

2868

2680

 

2449

2210

Columbus-OSU

3081

 

2955

2802

2625

 

2413

2181

Columbus City

3290

 

3162

3005

2820

 

2600

2358

Coshocton

2960

 

2830

2671

2490

 

2273

2049

Dayton

3442

 

3302

3133

2936

 

2695

2441

Defiance

2827

 

2716

2582

2416

 

2213

1996

Delaware

2891

 

2771

2623

2451

 

2240

2019

Dennison

2776

 

2648

2497

2322

 

2116

1898

Dorset

2389

 

2290

2170

2035

 

1865

1700

Eaton

3006

 

2879

2727

2561

 

2335

2121

Elyria

2896

 

2783

2647

2491

 

2289

2072

Fernbank Dam

3364

 

3226

3061

2879

 

2644

2406

Findlay

2806

 

2695

2560

2397

 

2194

1977

Franklin

3126

 

2990

2826

2649

 

2413

2180

Fredericktown

2689

 

2573

2434

2280

 

2078

1870

Fremont

2890

 

2776

2639

2481

 

2267

2050

Gallipolis

3242

 

3089

2907

2707

 

2474

2233

Geneva

2724

 

2634

2520

2389

 

2207

2010

Greenville

2695

 

2578

2431

2275

 

2063

1861

Hamilton

3296

 

3154

2979

2785

 

2550

2309

Hillsboro

3090

 

2961

2804

2625

 

2414

2185

Hiram

2668

 

2565

2440

2289

 

2110

1911

Hoytville

2809

 

2684

2532

2361

 

2145

1930

Ironton

3459

 

3299

3115

2909

 

2675

2425

Irwin

2825

 

2704

2552

2383

 

2173

1952

Jackson

2916

 

2775

2607

2421

 

2202

1978

Kenton

2832

 

2716

2576

2412

 

2216

1999

Lancaster

2956

 

2826

2666

2489

 

2271

2044

Lima

2941

 

2822

2675

2501

 

2289

2064

London

2934

 

2813

2662

2491

 

2280

2056

Marion

2941

 

2818

2668

2493

 

2279

2053

Marysville

2823

 

2705

2560

2395

 

2190

1974

McConnelsville

3029

 

2897

2740

2561

 

2353

2126

Millersburg

2790

 

2673

2528

2363

 

2160

1948

Millersport

2488

 

2376

2242

2085

 

1893

1693

Mineral Ridge

2803

 

2686

2538

2374

 

2171

1957

Montpelier

2906

 

2789

2647

2476

 

2271

2052

Napoleon

2896

 

2779

2638

2470

 

2271

2049

Newark

2894

 

2767

2611

2434

 

2221

1999

New Lexington

2815

 

2685

2523

2350

 

2139

1924

Norwalk

2792

 

2681

2543

2381

 

2187

1977

Oberlin

2808

 

2693

2555

2392

 

2194

1982

Painesville

2821

 

2737

2622

2488

 

2301

2101   

Pandora

2746

 

2631

2490

2328

 

2118

1898

Paulding

2852

 

2736

2595

2426

 

2222

2004

Peebles

3113

 

2972

2800

2612

 

2386

2152

Philo

3046

 

2907

2740

2557

 

2336

2109

Plymouth

2786

 

2669

2528

2365

 

2166

1951

Portsmouth

3546

 

3393

3207

3003

 

2759

2508

Put-in-Bay

3142

 

3050

2934

2776

 

2573

2343

Ravenna Arsenal

2562

 

2451

2317

2168

 

1978

1775

Sandusky

3094

 

2991

2865

2701

 

2495

2269

Senecaville Dam

2788

 

2665

2511

2342

 

2130

1913

Sidney

2846

 

2730

2588

2432

 

2219

2005

Springfield

3116

 

2979

2813

2635

 

2416

2186

Steubenville

3033

 

2910

2756

2588

 

2376

2156

Tiffin

2953

 

2834

2690

2518

 

2308

2085

Tom Jenkins Dam

2519

 

2392

2243

2084

 

1886

1688

Upper Sandusky

2935

 

2815

2666

2493

 

2279

2054

Urbana

2889

 

2773

2627

2458

 

2250

2031

Van Wert

2973

 

2848

2697

2520

 

2308

2082

Warren

2743

 

2625

2483

2320

 

2119

1910

Washington Court House

3081

 

2954

2794

2617

 

2398

2170

Wauseon

2752

 

2645

2513

2351

 

2152

1937

Waverly

3043

 

2903

2733

2547

 

2323

2092

Wilmington

3088

 

2954

2789

2606

 

2383

2154

Wooster

2649

 

2542

2410

2255

 

2067

1859

Xenia

3044

 

2912

2748

2566

 

2345

2117

Zanesville

2740

 

2618

2468

2308

 

2099

1883