Accumulated heat units
Useful for timing pest emergence and predicting maturity. Historical data via Open-Meteo (~2 day lag).
Pest emergence alerts
- Colorado potato beetle — First adult emergence from overwintering — start scouting foliage.
- Cabbage maggot — First-generation adult fly emergence — consider row cover on transplants.
- Squash vine borer — Adult moth flight begins — watch for entry holes and frass at stem bases.
- Imported cabbageworm — First-generation adult butterfly activity — early sign to check leaf undersides for eggs.
Total: 2433.6 GDD (50°F base)
| Date | Daily GDD | Cumulative |
|---|---|---|
| 2026-05-01 | 5.3 | 5.3 |
| 2026-05-02 | 0.3 | 5.5 |
| 2026-05-03 | 1.1 | 6.7 |
| 2026-05-04 | 8.9 | 15.5 |
| 2026-05-05 | 11 | 26.6 |
| 2026-05-06 | 9 | 35.6 |
| 2026-05-07 | 6 | 41.6 |
| 2026-05-08 | 3 | 44.6 |
| 2026-05-09 | 3 | 47.6 |
| 2026-05-10 | 6.2 | 53.8 |
| 2026-05-11 | 5.6 | 59.4 |
| 2026-05-12 | 3.5 | 63 |
| 2026-05-13 | 0.1 | 63.1 |
| 2026-05-14 | 3.7 | 66.8 |
| 2026-05-15 | 2.8 | 69.6 |
| 2026-05-16 | 12.4 | 82 |
| 2026-05-17 | 21.3 | 103.3 |
| 2026-05-18 | 6.8 | 110 |
| 2026-05-19 | 20.2 | 130.2 |
| 2026-05-20 | 26 | 156.2 |
| 2026-05-21 | 8.3 | 164.4 |
| 2026-05-22 | 7 | 171.5 |
| 2026-05-23 | 4.8 | 176.3 |
| 2026-05-24 | 1.2 | 177.5 |
| 2026-05-25 | 10.4 | 187.9 |
| 2026-05-26 | 15.8 | 203.7 |
| 2026-05-27 | 23.3 | 227 |
| 2026-05-28 | 10.5 | 237.5 |
| 2026-05-29 | 6.7 | 244.2 |
| 2026-05-30 | 0.9 | 245.1 |
| 2026-05-31 | 7 | 252 |
| 2026-06-01 | 6.6 | 258.6 |
| 2026-06-02 | 11.4 | 270 |
| 2026-06-03 | 14.7 | 284.7 |
| 2026-06-04 | 17.8 | 302.4 |
| 2026-06-05 | 19.5 | 321.9 |
| 2026-06-06 | 8 | 329.9 |
| 2026-06-07 | 15.7 | 345.6 |
| 2026-06-08 | 14.1 | 359.7 |
| 2026-06-09 | 19.9 | 379.5 |
| 2026-06-10 | 21.2 | 400.7 |
| 2026-06-11 | 24.6 | 425.2 |
| 2026-06-12 | 18.9 | 444.2 |
| 2026-06-13 | 22.1 | 466.3 |
| 2026-06-14 | 21.5 | 487.8 |
| 2026-06-15 | 19.6 | 507.4 |
| 2026-06-16 | 16.2 | 523.6 |
| 2026-06-17 | 14.4 | 538 |
| 2026-06-18 | 12.6 | 550.6 |
| 2026-06-19 | 18.6 | 569.1 |
| 2026-06-20 | 15.7 | 584.8 |
| 2026-06-21 | 16.3 | 601 |
| 2026-06-22 | 13.5 | 614.6 |
| 2026-06-23 | 15.9 | 630.5 |
| 2026-06-24 | 20 | 650.4 |
| 2026-06-25 | 19.5 | 669.9 |
| 2026-06-26 | 15 | 684.9 |
| 2026-06-27 | 17.1 | 702 |
| 2026-06-28 | 18.7 | 720.7 |
| 2026-06-29 | 20.5 | 741.2 |
| 2026-06-30 | 19.8 | 761 |
| 2026-07-01 | 28.1 | 789.1 |
| 2026-07-02 | 35.7 | 824.8 |
| 2026-07-03 | 34.3 | 859.1 |
| 2026-07-04 | 27.8 | 886.9 |
| 2026-07-05 | 22 | 908.9 |
| 2026-07-06 | 17.3 | 926.1 |
| 2026-07-07 | 14.3 | 940.5 |
| 2026-07-08 | 18.5 | 959 |
| 2026-07-09 | 27 | 986 |
| 2026-07-10 | 27.2 | 1013.2 |
| 2026-07-11 | 23.8 | 1037 |
| 2026-07-12 | 22.7 | 1059.7 |
| 2026-07-13 | 21.8 | 1081.4 |
| 2026-07-14 | 30.3 | 1111.7 |
| 2026-07-15 | 28.3 | 1140 |
| 2026-07-16 | 23.5 | 1163.5 |
| 2026-07-17 | 20.2 | 1183.6 |
| 2026-07-18 | 16.8 | 1200.4 |
| 2026-07-19 | 20.6 | 1221 |
| 2026-07-20 | 20.2 | 1241.2 |
| 2026-07-21 | 18.2 | 1259.4 |
| 2026-07-22 | 22.8 | 1282.3 |
| 2026-07-23 | 18.9 | 1301.2 |
| 2026-07-24 | 17.5 | 1318.7 |
| 2026-07-25 | 17.3 | 1336 |
| 2026-07-26 | 12 | 1348 |
| 2026-07-27 | 14 | 1362 |
| 2026-07-28 | 15.8 | 1377.9 |
| 2026-07-29 | 16.1 | 1393.9 |
| 2026-07-30 | 19 | 1412.9 |
| 2026-07-31 | 22.4 | 1435.4 |
| 2026-08-01 | 22.7 | 1458.1 |
| 2026-08-02 | 25 | 1483.1 |
| 2026-08-03 | 20.7 | 1503.8 |
| 2026-08-04 | 23.8 | 1527.6 |
| 2026-08-05 | 21.8 | 1549.3 |
| 2026-08-06 | 28.1 | 1577.4 |
| 2026-08-07 | 29.9 | 1607.3 |
| 2026-08-08 | 24 | 1631.3 |
| 2026-08-09 | 28.2 | 1659.4 |
| 2026-08-10 | 24.1 | 1683.5 |
| 2026-08-11 | 24.1 | 1707.6 |
| 2026-08-12 | 22.9 | 1730.5 |
| 2026-08-13 | 20.7 | 1751.1 |
| 2026-08-14 | 19 | 1770.1 |
| 2026-08-15 | 17.3 | 1787.5 |
| 2026-08-16 | 13.8 | 1801.3 |
| 2026-08-17 | 17.7 | 1818.9 |
| 2026-08-18 | 20 | 1838.9 |
| 2026-08-19 | 19.3 | 1858.2 |
| 2026-08-20 | 22.7 | 1880.9 |
| 2026-08-21 | 19.8 | 1900.7 |
| 2026-08-22 | 16.6 | 1917.3 |
| 2026-08-23 | 15.8 | 1933.1 |
| 2026-08-24 | 19.3 | 1952.4 |
| 2026-08-25 | 18.4 | 1970.8 |
| 2026-08-26 | 20.7 | 1991.4 |
| 2026-08-27 | 18.7 | 2010.1 |
| 2026-08-28 | 24.1 | 2034.2 |
| 2026-08-29 | 17.8 | 2052 |
| 2026-08-30 | 18.8 | 2070.8 |
| 2026-08-31 | 16 | 2086.8 |
| 2026-09-01 | 13 | 2099.8 |
| 2026-09-02 | 13.1 | 2112.9 |
| 2026-09-03 | 14.5 | 2127.4 |
| 2026-09-04 | 19.1 | 2146.5 |
| 2026-09-05 | 15.4 | 2162 |
| 2026-09-06 | 12.9 | 2174.9 |
| 2026-09-07 | 17 | 2191.9 |
| 2026-09-08 | 17.9 | 2209.8 |
| 2026-09-09 | 9.6 | 2219.4 |
| 2026-09-10 | 23.3 | 2242.6 |
| 2026-09-11 | 15 | 2257.6 |
| 2026-09-12 | 10 | 2267.6 |
| 2026-09-13 | 12.5 | 2280.1 |
| 2026-09-14 | 11.2 | 2291.3 |
| 2026-09-15 | 8 | 2299.3 |
| 2026-09-16 | 12.4 | 2311.7 |
| 2026-09-17 | 14.3 | 2326 |
| 2026-09-18 | 15.3 | 2341.3 |
| 2026-09-19 | 7 | 2348.4 |
| 2026-09-20 | 4 | 2352.4 |
| 2026-09-21 | 7.9 | 2360.3 |
| 2026-09-22 | 6.6 | 2366.9 |
| 2026-09-23 | 5.3 | 2372.1 |
| 2026-09-24 | 7.5 | 2379.6 |
| 2026-09-25 | 10.5 | 2390 |
| 2026-09-26 | 12.9 | 2402.9 |
| 2026-09-27 | 5.8 | 2408.7 |
| 2026-09-28 | 5.2 | 2413.9 |
| 2026-09-29 | 9.8 | 2423.7 |
| 2026-09-30 | 9.9 | 2433.6 |