Section 4 Table of Contents

Table 1.4-1. Approximate relative maturity rating and growing degree days available for Pennsylvania corn maturity zones.
Maturity zone¹ Approximate relative maturity rating Growing degree days Planting dates
¹ See map, Figure 1.4-1.
1 90–95 1,600–1,824 May 15–25
96–100 1,825–2,024
2 101–105 2,025–2,350 May 1–15
106–110 2,350–2,499
3 111–115 2,500–2,724 April 25–May 7
>115 2,725–2,949
4 >115 2,950–3,174 April 15–May 1
>115 3,175 or >