Table 1.4-1. Approximate relative maturity rating and growing degree days available for Pennsylvania corn maturity zones.

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
Maturity zone¹	Relative maturity rating	Growing degree days	Planting dates
¹ See map, Figure 1.4-1.
1	90-95	1,600-1,824	5/15-25
1	96-100	1,825 - 2,024	5/15-25
2	101-105	2,025 - 2,350	5/1-15
2	106-110	2,350 - 2,499	5/1-15
3	111-115	2,500 - 2,724	4/25-5/7
3	>115	2,725 - 2,949	4/25-5/7
4	>115	2,950 - 3,174	4/15-5/1
4	>115	3,175 or >	4/15-5/1