Growing degree days · base 50°F
Growing degree days in Saint Louis, MO
Season to date · since January 1
4,637GDD
Peak accumulated heat
The season has banked substantial heat. Warm-season grass is at its strongest; cool-season grass may be under heat stress and should not be pushed with nitrogen.
This week in Saint Louis
Saint Louis, MO added 142 growing degree days this past week, 20.3 a day, reaching 4,637 for the season. Its warmest day added 27.
| Day | Added | Season total |
|---|---|---|
| Tue | 14 | 4,509 |
| Wed | 22 | 4,531 |
| Thu | 20 | 4,550 |
| Fri | 21 | 4,572 |
| Sat | 20 | 4,592 |
| Sun | 19 | 4,610 |
| Mon | 27 | 4,637 |
PGR reapplication tracking
Plant growth regulator timing uses a Celsius-scale accumulation, not the seasonal Fahrenheit one. This page tracks a 10°C base, which is the Bermuda (warm-season) figure. Trinexapac-ethyl is typically re-sprayed near 200 GDD on cool-season turf and roughly 216 to 230 on warm-season turf, measured from your last application rather than from January. Always follow the product label.
Track GDD from your own spray date →Soil temperature right now in Saint Louis, MO
GDD is a trend indicator. Soil temperature is the signal that actually decides pre-emergent and seeding timing, and it is 70.2°F here at 2 inches.
Full soil report for 63101 →Nearby
Growing degree days near Saint Louis
- Springfield, IL86 miles from Saint Louis · ZIP 62701
- Columbia, MO116 miles from Saint Louis · ZIP 65201
- Peoria, IL146 miles from Saint Louis · ZIP 61601
- Evansville, IN149 miles from Saint Louis · ZIP 47701
- Springfield, MO196 miles from Saint Louis · ZIP 65801
- Indianapolis, IN232 miles from Saint Louis · ZIP 46201
Get this number every morning
This page recalculates when you load it. The app accumulates GDD for Saint Louis, MO daily and tells you when your PGR window opens. Free on iPhone and Android.