Welcome!

It appears to be your first time visiting GDDTracker
Please enter your zip code for a customized experience. Also, be sure and watch our video introduction video.

Relative Flowering Times for Broadleaf Weeds (GDD 50)
forecast for Fri, May. 24. 2019

Forecasted GDD Total: 217 (Base 50) through Fri, May. 24, 2019

Forecast »

5/24

Late Season (Biennials and Perennials)

1401

Mid Season and Late Season (SA and Perennials)

601

Mid Season (Perennials)

201

Early and Mid Season (WA and Perennials)

Early Season (WA)

Generously Supported By:

Tabular Data

Daily GDD accumulation for various base temperature models in 2018 & 2019

2019	Lo (F)	Hi (F)	GDD 22	GDD 32	GDD 42	GDD 50	GDD 55
02-15	17°	40°	7	0	0	0	0
02-16	20°	26°	8	0	0	0	0
02-17	20°	25°	8	0	0	0	0
02-18	5°	25°	8	0	0	0	0
02-19	-2°	27°	8	0	0	0	0
02-20	20°	36°	14	0	0	0	0
02-21	28°	35°	23	0	0	0	0
02-22	21°	38°	31	0	0	0	0
02-23	29°	41°	44	3	0	0	0
02-24	24°	46°	57	6	0	0	0
02-25	14°	23°	57	6	0	0	0
02-26	11°	20°	57	6	0	0	0
2019	Lo (F)	Hi (F)	GDD 22	GDD 32	GDD 42	GDD 50	GDD 55
02-27	16°	24°	57	6	0	0	0
02-28	13°	29°	57	6	0	0	0
03-01	17°	36°	62	6	0	0	0
03-02	26°	32°	68	6	0	0	0
03-03	12°	25°	68	6	0	0	0
03-04	8°	13°	68	6	0	0	0
03-05	8°	17°	68	6	0	0	0
03-06	5°	21°	68	6	0	0	0
03-07	13°	26°	68	6	0	0	0
03-08	12°	38°	72	6	0	0	0
03-09	21°	39°	80	6	0	0	0
03-10	34°	44°	97	13	0	0	0
2019	Lo (F)	Hi (F)	GDD 22	GDD 32	GDD 42	GDD 50	GDD 55
03-11	28°	36°	107	13	0	0	0
03-12	22°	46°	119	15	0	0	0
03-13	36°	52°	141	27	2	0	0
03-14	46°	61°	172	49	14	4	0
03-15	33°	44°	189	55	14	4	0
03-16	28°	35°	198	55	14	4	0
03-17	19°	37°	204	55	14	4	0
03-18	22°	41°	214	55	14	4	0
03-19	23°	48°	227	59	14	4	0
03-20	31°	44°	243	64	14	4	0
03-21	35°	40°	259	70	14	4	0
03-22	30°	42°	273	74	14	4	0
2019	Lo (F)	Hi (F)	GDD 22	GDD 32	GDD 42	GDD 50	GDD 55
03-23	20°	47°	284	76	14	4	0
03-24	31°	55°	306	87	15	4	0
03-25	29°	43°	319	91	15	4	0
03-26	22°	44°	330	92	15	4	0
03-27	27°	54°	349	101	15	4	0
03-28	45°	66°	383	124	29	9	1
03-29	38°	55°	407	139	33	9	1
03-30	31°	44°	423	144	33	9	1
03-31	21°	33°	428	144	33	9	1
04-01	20°	44°	438	145	33	9	1
04-02	35°	57°	462	159	37	9	1
04-03	38°	52°	485	172	40	9	1
2019	Lo (F)	Hi (F)	GDD 22	GDD 32	GDD 42	GDD 50	GDD 55
04-04	34°	44°	503	179	40	9	1
04-05	34°	51°	523	189	41	9	1
04-06	34°	64°	551	207	48	9	1
04-07	45°	71°	587	233	64	17	4
04-08	55°	69°	627	263	84	29	11
04-09	44°	62°	657	283	95	32	11
04-10	34°	47°	676	292	95	32	11
04-11	32°	49°	694	301	95	32	11
04-12	43°	59°	724	320	104	33	11
04-13	36°	52°	746	332	106	33	11
04-14	32°	39°	759	335	106	33	11
04-15	32°	51°	779	345	106	33	11
2019	Lo (F)	Hi (F)	GDD 22	GDD 32	GDD 42	GDD 50	GDD 55
04-16	36°	65°	808	364	115	34	11
04-17	44°	60°	838	384	126	36	11
04-18	43°	64°	869	405	137	40	11
04-19	40°	42°	888	414	137	40	11
04-20	38°	51°	911	427	139	40	11
04-21	33°	71°	940	447	149	41	11
04-22	49°	75°	981	477	170	54	18
04-23	46°	66°	1015	501	183	60	19
04-24	34°	62°	1041	517	189	60	19
04-25	50°	65°	1076	543	205	67	21
04-26	49°	63°	1110	566	219	73	22
04-27	35°	49°	1130	576	219	73	22
2019	Lo (F)	Hi (F)	GDD 22	GDD 32	GDD 42	GDD 50	GDD 55
04-28	34°	55°	1153	589	222	73	22
04-29	40°	45°	1174	600	222	73	22
04-30	40°	49°	1196	613	225	73	22
05-01	44°	64°	1229	635	237	77	22
05-02	45°	58°	1258	655	247	79	22
05-03	43°	51°	1283	669	252	79	22
05-04	45°	64°	1316	692	265	84	22
05-05	41°	71°	1350	716	279	90	23
05-06	50°	72°	1389	745	298	101	29
05-07	40°	54°	1414	760	303	101	29
05-08	39°	57°	1440	776	309	101	29
05-09	52°	74°	1481	807	330	114	37
2019	Lo (F)	Hi (F)	GDD 22	GDD 32	GDD 42	GDD 50	GDD 55
05-10	45°	56°	1510	826	338	115	37
05-11	36°	52°	1532	838	341	115	37
05-12	41°	53°	1557	854	346	115	37
05-13	44°	55°	1585	871	354	115	37
05-14	36°	68°	1615	891	363	117	37
05-15	43°	72°	1650	916	379	124	40
05-16	46°	76°	1689	945	398	135	46
05-17	59°	67°	1730	976	419	148	54
05-18	48°	75°	1770	1006	438	160	60
05-19	59°	73°	1814	1040	462	175	71
05-20	44°	61°	1844	1060	473	178	71
05-21	38°	61°	1872	1078	480	178	71
2019	Lo (F)	Hi (F)	GDD 22	GDD 32	GDD 42	GDD 50	GDD 55
05-22	50°	72°	1911	1107	500	189	77
05-23	63°	75°	1958	1144	527	208	92
05-24	47°	70°	1995	1171	543	217	95
05-25	61°	79°	2043	1209	571	237	110
05-26	57°	74°	2086	1242	595	252	121
05-27	53°	71°	2126	1272	615	264	128
05-28	52°	72°	2166	1302	635	277	135
05-29	55°	72°	2208	1334	657	290	143

2018	Lo (F)	Hi (F)	GDD 22	GDD 32	GDD 42	GDD 50	GDD 55
02-15	38°	44°	19	9	0	0	0
02-16	22°	36°	26	9	0	0	0
02-17	16°	33°	29	9	0	0	0
02-18	26°	36°	38	9	0	0	0
02-19	35°	55°	61	22	3	0	0
02-20	55°	61°	97	48	19	8	3
02-21	32°	50°	115	56	19	8	3
02-22	30°	40°	128	59	19	8	3
02-23	33°	45°	145	66	19	8	3
02-24	34°	41°	161	72	19	8	3
02-25	36°	49°	181	82	19	8	3
02-26	29°	50°	199	90	19	8	3
2018	Lo (F)	Hi (F)	GDD 22	GDD 32	GDD 42	GDD 50	GDD 55
02-27	37°	60°	226	107	26	8	3
02-28	43°	60°	256	127	36	9	3
03-01	31°	40°	269	130	36	9	3
03-02	26°	42°	282	133	36	9	3
03-03	23°	40°	291	133	36	9	3
03-04	26°	41°	303	134	36	9	3
03-05	26°	37°	312	134	36	9	3
03-06	30°	39°	325	137	36	9	3
03-07	24°	33°	331	137	36	9	3
03-08	22°	31°	335	137	36	9	3
03-09	26°	32°	342	137	36	9	3
03-10	19°	34°	347	137	36	9	3
2018	Lo (F)	Hi (F)	GDD 22	GDD 32	GDD 42	GDD 50	GDD 55
03-11	20°	37°	354	137	36	9	3
03-12	23°	36°	361	137	36	9	3
03-13	25°	33°	368	137	36	9	3
03-14	23°	39°	377	137	36	9	3
03-15	25°	36°	386	137	36	9	3
03-16	21°	38°	393	137	36	9	3
03-17	22°	48°	406	140	36	9	3
03-18	25°	56°	425	149	36	9	3
03-19	25°	44°	438	152	36	9	3
03-20	22°	39°	446	152	36	9	3
03-21	25°	37°	455	152	36	9	3
03-22	22°	44°	467	153	36	9	3
2018	Lo (F)	Hi (F)	GDD 22	GDD 32	GDD 42	GDD 50	GDD 55
03-23	24°	42°	477	154	36	9	3
03-24	23°	40°	487	154	36	9	3
03-25	21°	40°	496	154	36	9	3
03-26	27°	52°	513	161	36	9	3
03-27	42°	52°	538	176	41	9	3
03-28	39°	45°	558	186	41	9	3
03-29	41°	47°	580	198	43	9	3
03-30	29°	45°	595	203	43	9	3
03-31	32°	46°	612	210	43	9	3
04-01	27°	37°	623	211	43	9	3
04-02	19°	42°	631	211	43	9	3
04-03	34°	38°	646	215	43	9	3
2018	Lo (F)	Hi (F)	GDD 22	GDD 32	GDD 42	GDD 50	GDD 55
04-04	26°	33°	653	215	43	9	3
04-05	25°	41°	665	216	43	9	3
04-06	25°	38°	674	216	43	9	3
04-07	19°	34°	678	216	43	9	3
04-08	16°	39°	684	216	43	9	3
04-09	30°	38°	696	218	43	9	3
04-10	25°	45°	709	221	43	9	3
04-11	33°	57°	732	234	46	9	3
04-12	43°	70°	766	259	60	16	5
04-13	39°	60°	794	276	68	16	5
04-14	30°	39°	807	279	68	16	5
04-15	30°	34°	817	279	68	16	5
2018	Lo (F)	Hi (F)	GDD 22	GDD 32	GDD 42	GDD 50	GDD 55
04-16	31°	36°	828	280	68	16	5
04-17	27°	34°	836	280	68	16	5
04-18	30°	42°	851	284	68	16	5
04-19	32°	53°	871	295	69	16	5
04-20	30°	58°	893	307	71	16	5
04-21	32°	58°	916	320	74	16	5
04-22	32°	63°	941	335	79	16	5
04-23	38°	72°	974	358	92	21	5
04-24	53°	59°	1008	382	106	27	6
04-25	43°	60°	1038	401	115	28	6
04-26	31°	64°	1063	417	121	28	6
04-27	40°	60°	1091	435	128	28	6
2018	Lo (F)	Hi (F)	GDD 22	GDD 32	GDD 42	GDD 50	GDD 55
04-28	37°	54°	1114	448	131	28	6
04-29	30°	59°	1136	460	134	28	6
04-30	31°	72°	1166	480	143	30	6
05-01	56°	83°	1213	517	171	50	20
05-02	65°	85°	1267	560	204	75	40
05-03	61°	68°	1310	593	227	90	50
05-04	56°	69°	1350	624	247	102	58
05-05	55°	79°	1395	659	272	119	70
05-06	50°	66°	1431	685	288	127	73
05-07	39°	68°	1462	706	300	130	73
05-08	49°	80°	1505	738	322	145	82
05-09	55°	81°	1550	774	347	162	94
2018	Lo (F)	Hi (F)	GDD 22	GDD 32	GDD 42	GDD 50	GDD 55
05-10	57°	66°	1590	804	367	174	101
05-11	40°	54°	1615	819	372	174	101
05-12	42°	52°	1640	834	377	174	101
05-13	47°	61°	1672	856	389	178	101
05-14	51°	75°	1713	887	410	191	109
05-15	60°	72°	1757	921	435	207	120
05-16	52°	79°	1800	954	458	222	131
05-17	52°	76°	1842	986	480	236	140
05-18	47°	76°	1882	1016	499	248	146
05-19	56°	71°	1924	1047	521	262	155
05-20	53°	59°	1958	1071	535	268	156
05-21	48°	64°	1992	1095	549	274	157
2018	Lo (F)	Hi (F)	GDD 22	GDD 32	GDD 42	GDD 50	GDD 55
05-22	51°	66°	2028	1122	566	282	161
05-23	48°	79°	2070	1154	588	296	169
05-24	50°	82°	2114	1188	611	312	180
05-25	58°	87°	2165	1229	642	335	198
05-26	68°	86°	2220	1274	678	362	220
05-27	62°	92°	2275	1319	713	389	243
05-28	62°	93°	2331	1365	748	417	265
05-29	68°	91°	2388	1412	786	446	290
05-30	71°	87°	2445	1459	823	475	314
05-31	72°	85°	2502	1505	859	504	337
06-01	62°	81°	2551	1545	889	525	353
06-02	54°	65°	2589	1573	906	535	358
2018	Lo (F)	Hi (F)	GDD 22	GDD 32	GDD 42	GDD 50	GDD 55
06-03	60°	70°	2632	1606	929	550	368
06-04	57°	71°	2674	1638	951	564	377
06-05	56°	67°	2714	1667	971	576	384
06-06	46°	72°	2751	1694	988	585	388
06-07	60°	82°	2800	1733	1017	606	404
06-08	59°	81°	2848	1771	1045	626	419
06-09	62°	71°	2893	1806	1070	643	431
06-10	58°	68°	2934	1837	1091	656	439
06-11	57°	79°	2980	1873	1117	674	452
06-12	59°	76°	3025	1909	1142	691	464
06-13	63°	80°	3074	1948	1172	712	481
06-14	54°	82°	3120	1984	1198	730	494
2018	Lo (F)	Hi (F)	GDD 22	GDD 32	GDD 42	GDD 50	GDD 55
06-15	58°	81°	3168	2021	1225	750	508
06-16	66°	85°	3221	2065	1258	775	528
06-17	70°	93°	3280	2114	1297	806	554
06-18	74°	91°	3340	2164	1338	838	582
06-19	67°	74°	3389	2202	1366	859	597
06-20	60°	71°	3432	2236	1390	874	608
06-21	56°	76°	3476	2270	1414	890	619
06-22	60°	74°	3521	2305	1439	907	631
06-23	62°	73°	3567	2341	1464	925	643
06-24	60°	72°	3611	2375	1489	941	655
06-25	55°	76°	3655	2408	1512	957	665
06-26	54°	79°	3699	2443	1537	973	677
2018	Lo (F)	Hi (F)	GDD 22	GDD 32	GDD 42	GDD 50	GDD 55
06-27	66°	73°	3747	2481	1564	993	691
06-28	62°	86°	3799	2523	1596	1017	710
06-29	64°	90°	3853	2567	1631	1043	732
06-30	76°	91°	3915	2619	1673	1077	760
07-01	72°	93°	3976	2669	1713	1110	788
07-02	70°	85°	4031	2715	1749	1137	810
07-03	61°	90°	4085	2759	1782	1163	831
07-04	71°	92°	4144	2808	1822	1194	858
07-05	75°	92°	4206	2860	1863	1228	886
07-06	62°	76°	4253	2897	1890	1247	900
07-07	50°	80°	4296	2930	1914	1262	910
07-08	53°	86°	4344	2967	1941	1282	925
2018	Lo (F)	Hi (F)	GDD 22	GDD 32	GDD 42	GDD 50	GDD 55
07-09	59°	88°	4395	3009	1972	1305	943
07-10	67°	85°	4449	3053	2006	1331	964
07-11	58°	83°	4497	3091	2035	1351	980
07-12	57°	84°	4546	3129	2063	1372	995
07-13	65°	91°	4602	3176	2099	1400	1018
07-14	68°	82°	4655	3219	2132	1425	1038
07-15	67°	91°	4712	3265	2169	1454	1062
07-16	70°	87°	4768	3312	2205	1482	1085
07-17	60°	79°	4816	3349	2233	1502	1100
07-18	55°	78°	4860	3384	2257	1518	1111
07-19	55°	84°	4908	3421	2285	1538	1126
07-20	66°	80°	4959	3462	2316	1561	1144
2018	Lo (F)	Hi (F)	GDD 22	GDD 32	GDD 42	GDD 50	GDD 55
07-21	65°	76°	5007	3501	2345	1581	1160
07-22	64°	71°	5053	3537	2371	1599	1173
07-23	64°	76°	5101	3575	2399	1619	1188
07-24	65°	81°	5152	3616	2430	1642	1206
07-25	61°	84°	5203	3656	2460	1665	1223
07-26	64°	81°	5253	3697	2490	1687	1240
07-27	59°	75°	5298	3731	2515	1704	1252
07-28	56°	78°	5342	3766	2540	1720	1264
07-29	54°	80°	5387	3801	2565	1737	1276
07-30	56°	81°	5434	3838	2592	1756	1290
07-31	57°	78°	5479	3873	2617	1773	1302
08-01	63°	80°	5529	3912	2646	1795	1318
2018	Lo (F)	Hi (F)	GDD 22	GDD 32	GDD 42	GDD 50	GDD 55
08-02	62°	85°	5580	3954	2678	1818	1337
08-03	64°	83°	5632	3996	2709	1842	1355
08-04	57°	90°	5684	4037	2741	1866	1374
08-05	71°	93°	5743	4087	2781	1897	1401
08-06	70°	79°	5796	4130	2813	1922	1420
08-07	68°	84°	5850	4174	2847	1948	1441
08-08	67°	82°	5902	4216	2880	1972	1461
08-09	63°	80°	5952	4255	2909	1994	1477
08-10	65°	83°	6003	4297	2941	2017	1496
08-11	58°	83°	6052	4336	2969	2038	1511
08-12	61°	84°	6102	4376	3000	2060	1529
08-13	60°	84°	6152	4416	3030	2082	1546
2018	Lo (F)	Hi (F)	GDD 22	GDD 32	GDD 42	GDD 50	GDD 55
08-14	60°	87°	6204	4457	3061	2106	1564
08-15	65°	86°	6257	4501	3094	2131	1584
08-16	66°	80°	6308	4542	3125	2154	1602
08-17	68°	76°	6357	4581	3155	2175	1619
08-18	66°	81°	6409	4623	3187	2199	1637
08-19	64°	82°	6460	4664	3218	2222	1656
08-20	64°	81°	6511	4704	3248	2245	1673
08-21	68°	74°	6560	4743	3277	2266	1689
08-22	58°	75°	6604	4778	3302	2282	1700
08-23	54°	80°	6649	4813	3327	2299	1712
08-24	57°	76°	6694	4847	3351	2316	1724
08-25	66°	77°	6743	4887	3381	2337	1740
2018	Lo (F)	Hi (F)	GDD 22	GDD 32	GDD 42	GDD 50	GDD 55
08-26	69°	86°	6798	4932	3416	2364	1762
08-27	71°	88°	6856	4979	3453	2394	1787
08-28	69°	87°	6912	5025	3489	2422	1810
08-29	63°	76°	6959	5063	3517	2441	1824
08-30	51°	71°	6999	5092	3536	2453	1831
08-31	55°	82°	7045	5129	3563	2471	1845
09-01	67°	81°	7097	5171	3595	2495	1864
09-02	70°	86°	7154	5217	3631	2524	1887
09-03	70°	84°	7209	5262	3666	2551	1909
09-04	69°	90°	7266	5310	3703	2580	1933
09-05	71°	90°	7325	5359	3742	2611	1959
09-06	62°	71°	7369	5393	3767	2627	1971
2018	Lo (F)	Hi (F)	GDD 22	GDD 32	GDD 42	GDD 50	GDD 55
09-07	56°	69°	7410	5424	3787	2640	1978
09-08	55°	67°	7449	5452	3806	2651	1984
09-09	52°	64°	7485	5479	3822	2659	1987
09-10	54°	65°	7523	5506	3840	2669	1992
09-11	50°	76°	7564	5538	3861	2682	2000
09-12	53°	79°	7608	5572	3885	2698	2011
09-13	56°	77°	7652	5606	3909	2714	2022
09-14	63°	80°	7702	5645	3939	2736	2039
09-15	56°	84°	7750	5683	3967	2756	2054
09-16	63°	86°	7802	5726	4000	2780	2074
09-17	62°	88°	7855	5769	4033	2805	2094
09-18	62°	85°	7907	5810	4064	2829	2112
2018	Lo (F)	Hi (F)	GDD 22	GDD 32	GDD 42	GDD 50	GDD 55
09-19	64°	78°	7955	5849	4093	2849	2128
09-20	65°	80°	8006	5890	4123	2872	2145
09-21	59°	77°	8052	5926	4150	2890	2158
09-22	47°	64°	8086	5949	4163	2896	2159
09-23	42°	71°	8121	5974	4178	2903	2161
09-24	49°	69°	8157	6001	4195	2911	2165
09-25	67°	78°	8208	6041	4225	2934	2182
09-26	47°	67°	8243	6066	4240	2941	2184
09-27	45°	64°	8275	6089	4253	2945	2184
09-28	48°	62°	8308	6112	4266	2950	2184
09-29	39°	60°	8335	6129	4273	2950	2184
09-30	42°	51°	8360	6144	4277	2950	2184
2018	Lo (F)	Hi (F)	GDD 22	GDD 32	GDD 42	GDD 50	GDD 55

Latest Updates

March 9^th, 2018Note Regarding 2018 Alerts

We had an issue with the emailed alerts that should be resolved now, and apologize for any inconvenience. You may receive outdated alerts tomorrow (Saturday, March 10, 2018), so please check the details before taking any action. Thank you.

February 17^th, 2018Welcome to a New GDD Season!

GDDTracker is ready for 2018 with GDD tracking that began on February 15. New this year will be the Smith-Kerns Dollar Spot Prediction Model which will be launching soon. Check back soon for additional details!

March 29^th, 2017Timing crabgrass pre-emergence applications

Please note that Dr. Frank has written another helpful article available from the MSU Extension web site.

http://msue.anr.msu.edu/news/timing_crabgrass_pre_emergence_applications

March 9^th, 2017Controlling Annual Bluegrass Seedheads: Spray Now or Wait?

Dr. Kevin Frank has posted a useful article at the MSU Extension website. Please note it is written specifically for Michigan but may apply to other midwest regions.

"Growing degree-days have accumulated quickly, but it may not yet be time to apply plant growth regulators to control annual bluegrass seedheads on golf courses.

February 26^th, 2017Early Spring in Michigan: Boom or Bust?

Dr. Kevin Frank has posted a helpful article on the MSU Extension website. Much of the midwest is experiencing the same (very) early warm-up, so non-Michiganders may find it help as well!

http://msue.anr.msu.edu/news/is_an_early_spring_a_boom_or_bust_for_golf_course_turf

February 16^th, 2017Missing weather data

All air temperature data has been accounted for now.

Zip code		Golf Course or Organization Name (optional)

Welcome!

Relative Flowering Times for Broadleaf Weeds (GDD 50) forecast for Fri, May. 24. 2019

Forecasted GDD Total: 217 (Base 50) through Fri, May. 24, 2019

East Lansing, MI

Tabular Data

Latest Updates

March 9th, 2018Note Regarding 2018 Alerts

February 17th, 2018Welcome to a New GDD Season!

March 29th, 2017Timing crabgrass pre-emergence applications

March 9th, 2017Controlling Annual Bluegrass Seedheads: Spray Now or Wait?

February 26th, 2017Early Spring in Michigan: Boom or Bust?