Phenology Dates and Corresponding Growing Degree Day Accumulations

Updated 8/22/2007

The Lake Erie Regional Grape Program

	Average Bud Break and dates				Average Bloom and dates				Average Veraison and dates
	Date	Julian	Jan. GDDs*	Apr. GDDs*	Date	Julian	Jan. GDDs	Apr. GDDs	Date	Julian	Jan. GDDs	Apr. GDDs
Ave	5/6	125.52	132.09	106.59	6/16	166.72	608.09	584.10	8/24	235.59	2004.67	1982.82
SD	8 days	7.73	25.76	29.12	6 days	6.23	33.46	30.58	6 days	6.03	135.89	132.10
MIN	4/19	109	91.0	45.5	5/31	151	517	513	8/5	217	1718.5	1714.5
MAX	5/20	140	182.5	172	6/26	177	658.5	648	9/3	246	2351	2325.5

	Bud Break				Bloom				Veraison
Year	Date	Julian date	January GDDs*	April GDDs**	Date	Julian date	January GDDs	April GDDs	Date	Julian date	January GDDs	April GDDs
2007	5/8	128	145.5	95.5	6/16	161	629.5	580.5	8/18	230	2074.5	2025.5
2006	4/30	120	124	104.5	6/14	165	606.5	587	8/22	234	2165.5	2146
2005	5/10	130	129	103.5	6/13	164	603	577.5	8/21	233	2351	2325.5
2004	5/2	122	153.5	114	6/8	159	652	612.5	8/23	235	2010.5	1971
2003	5/5	125	112	95	6/25	176	624	607	9/2	245	2096	2079
2002	4/19	109	145.5	129.5	6/20	171	643.5	627.5	8/25	237	2242	2226
2001	5/1	121	139	137	6/13	164	592.5	590.5	8/19	231	2045.5	2043.5
2000	5/3	123	109.5	45.5	6/12	163	596.5	532.5	8/22	234	1912	1848
1999	5/4	124	106	94	6/9	160	582	570	8/14	226	2047	2035
1998	4/27	117	134.5	45.5	6/5	156	611.5	522.5	8/17	229	2113.5	2024.5
1997	5/20	140	101	83	6/26	177	603.5	585.5	9/3	246	1831.5	1813.5
1996	5/15	136	134.5	125	6/19	171	657.5	648	8/26	239	2058.5	2049
1995	5/13	133	129	98	6/19	170	658.5	627.5	8/25	237	2276.5	2245.5
1994	5/2	122	110	97.5	6/19	170	589.5	577	8/27	239	1983	1970.5
1993	5/5	125	173	172	6/18	169	608	607	8/23	235	2014	2013
1992	5/8	129	120	115	6/17	169	615.5	610.5	9/2	246	1814	1809
1991	4/29	119	164.5	136.5	5/31	151	613	585	8/5	217	1922.5	1894.5
1990	4/27	117	158	87.5	6/15	166	637	566.5	8/24	236	1922.5	1922
1989	5/18	138	105	72	6/23	174	649	616	8/25	237	1940.5	1907.5
1988	5/9	130	115.5	109.5	6/16	168	597.5	591.5	8/23	236	2196.5	2190.5
1987	4/24	114	145.5	114.5	6/4	155	637.5	606.5	8/11	223	2099	2068
1986	4/28	118	162	104	6/9	160	655.5	597.5	8/19	231	2077.5	2019.5
1985	4/25	115	178.5	166	6/8	159	577.5	565	8/22	234	1935	1922.5
1984	5/14	135	97	94.5	6/19	171	589.5	587	8/26	239	1788	1785.5
1983	5/13	133	147	118	6/23	174	644	615	8/30	242	2163.5	2134.5
1982	5/7	127	104.5	100.5	6/14	165	517	513	8/24	236	1718.5	1714.5
1981	5/6	126	113.5	90.5	6/16	167	603.5	580.5	8/20	232	1917.5	1894.5
1980	5/13	134	91	91	6/23	175	538	538	8/29	242	2010	2010
1979	5/10	130	182.5	152	6/15	166	601	570.5	8/22	234	1868.5	1838
1978					6/18	169	570	570	8/26	238	1992.5	1992.5
1977					6/4	155	595	528	8/21	233	2072	2005
1976					6/14	166	627.5	568	8/24	237	1912	1852.5
1975					6/13	164	620.5	620.5	8/17	229	2037	2037
1974					6/17	168	633.5	618	8/29	241	2044.5	2029
1973					6/16	167	655	616.5	8/24	236	2112	2073.5
1972					6/19	171	570.5	570.5	9/1	245	1981.5	1981.5
1971					6/21	172	553	552	8/26	238	1853	1852
1970					6/10	161	603.5	603.5	8/21	233	2056.5	2056.5
1969					6/23	174	588.5	588.5	8/27	239	1944.5	1944.5
1968					6/21	173	656	609	8/31	244	2093	2046
1967					6/17	168	594	554	8/21	233	1882	1842
1966					6/23	174	586.5	562	8/30	242	2001	1976.5
1965					6/20	171	561	561	8/24	236	1764.5	1764.5
1964									8/14	227	1865	1865

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