Growing degree days · base 50°F
Growing degree days in Helena, MT
Season to date · since January 1
1,979GDD
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 Helena
Helena, MT added 42 growing degree days this past week, 6 a day, reaching 1,979 for the season. 3 of the seven added nothing, staying below the 50°F base.
| Day | Added | Season total |
|---|---|---|
| Tue | 13 | 1,951 |
| Wed | 7 | 1,958 |
| Thu | 8 | 1,965 |
| Fri | 14 | 1,979 |
| Sat | 0 | 1,979 |
| Sun | 0 | 1,979 |
| Mon | 0 | 1,979 |
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 Helena, MT
GDD is a trend indicator. Soil temperature is the signal that actually decides pre-emergent and seeding timing, and it is 42.0°F here at 2 inches.
Full soil report for 59601 →Nearby
Growing degree days near Helena
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This page recalculates when you load it. The app accumulates GDD for Helena, MT daily and tells you when your PGR window opens. Free on iPhone and Android.