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Michigan · county maple atlas

Maple sugaring in Genesee County, Michigan

Genesee County had 8 maple operations and 2,353 taps in the 2022 Census. Around Flint, sap usually runs from February 24 to March 28. Here's the long-run pattern, 36 seasons of sap weather, and the outlook this week.
Too early to tapAbout 141 days until the usual start.
Sap starts
Feb 24
typical year
Season ends
Mar 28
about 5 weeks
Sap days / season
39.1
1991–2026 average
Taps, 2022
2,353
#46 of 66 in MI

Sap-flow outlook at Flint right now

Full Michigan forecast →

Forecast for Flint, MI

Updated Oct 6, 9:49 AM EDT

Off-season for now. Sap needs freezing nights, and none are in sight. Genesee County's season usually opens around February 24, which is 141 days away.

No freeze-thaw days in the forecast

freeze thaw 32°F

  1. WedOct 7
    54° / 73°

    0h below · 24h above

    No refreeze forecast
  2. ThuOct 8
    47° / 65°

    0h below · 24h above

    No refreeze forecast
  3. FriOct 9
    41° / 66°

    0h below · 24h above

    No refreeze forecast
  4. SatOct 10
    45° / 71°

    0h below · 24h above

    No refreeze forecast
  5. SunOct 11
    54° / 76°

    0h below · 24h above

    No refreeze forecast
  6. MonOct 12
    53° / 70°
    No refreeze forecast

Data: National Weather Service. Verdicts use freeze-thaw thresholds from maple field research; your woods may run a little differently.

When the sap runs

The sugaring calendar at Flint

Freeze-thaw weather at Flint peaks in the weeks of Feb 23 to Apr 6, which hold about 49% of a season's sap days. March is the busiest month.
Typical season: Feb 24 – Mar 280246Week of Dec 1: 1.8 sap days on averageWeek of Dec 8: 1.8 sap days on averageWeek of Dec 15: 1.6 sap days on averageWeek of Dec 22: 1.4 sap days on averageWeek of Dec 29: 1.1 sap days on averageWeek of Jan 5: 1.3 sap days on averageWeek of Jan 12: 0.9 sap days on averageWeek of Jan 19: 0.9 sap days on averageWeek of Jan 26: 0.9 sap days on averageWeek of Feb 2: 1.5 sap days on averageWeek of Feb 9: 1.4 sap days on averageWeek of Feb 16: 1.9 sap days on averageWeek of Feb 23: 2.2 sap days on averageWeek of Mar 2: 2.6 sap days on averageWeek of Mar 9: 2.8 sap days on averageWeek of Mar 16: 3.4 sap days on averageWeek of Mar 23: 3.3 sap days on averageWeek of Mar 30: 2.7 sap days on averageWeek of Apr 6: 2.3 sap days on averageWeek of Apr 13: 1.4 sap days on averageWeek of Apr 20: 1.1 sap days on averageWeek of Apr 27: 0.5 sap days on averageWeek of May 4: 0.3 sap days on averageWeek of May 11: 0.1 sap days on averageWeek of May 18: 0.0 sap days on averageWeek of May 25: 0.0 sap days on averageDecJanFebMarAprMaytaps in ~Feb 24
Average number of freeze-thaw sap days in each week of the season at Flint, 1991–2026. A sap day is an overnight low under 30.2 °F followed by an afternoon high over 37.4 °F. The shaded band is the typical season.

Year-to-year spread

Opening signal
Median Feb 28; the middle half of seasons fell between Feb 21 and Mar 7. Earliest Feb 1 (2017), latest Mar 15 (2018).
Closing signal
Median Mar 31; middle half between Mar 24 and Apr 7. Earliest Mar 3 (2024), latest Apr 19 (2018).
Sap days by month
Dec18%Jan11%Feb18%Mar34%Apr18%May1%

36 seasons of sap weather

Genesee County seasons, 1991–2026

The best sap year at Flint was 2018 with 56 freeze-thaw days; the leanest was 2003 with 26. Seasons that start early tend to end early too: the trees run on the swing between freezing nights and mild days, and heat ends it.
JanFebMarAprMaysap days20262026: Feb 15 – Mar 19, 34 sap days3420252025: Feb 23 – Mar 28, 36 sap days3620242024: Feb 3 – Mar 3, 34 sap days3420232023: Feb 26 – Apr 2, 54 sap days5420222022: Mar 7 – Apr 10, 45 sap days4520212021: Feb 23 – Mar 22, 39 sap days3920202020: Feb 23 – Mar 25, 51 sap days5120192019: Mar 4 – Apr 2, 34 sap days3420182018: Mar 15 – Apr 19, 56 sap days5620172017: Feb 1 – Mar 6, 37 sap days3720162016: Feb 11 – Mar 13, 48 sap days4820152015: Mar 8 – Apr 5, 34 sap days3420142014: Mar 10 – Apr 9, 33 sap days3320132013: Mar 12 – Apr 14, 45 sap days4520122012: Feb 10 – Mar 12, 51 sap days5120112011: Mar 8 – Apr 9, 29 sap days2920102010: Feb 28 – Mar 31, 30 sap days3020092009: Feb 27 – Mar 31, 44 sap days4420082008: Mar 6 – Apr 6, 36 sap days3620072007: Feb 20 – Mar 21, 27 sap days2720062006: Feb 25 – Mar 30, 41 sap days4120052005: Mar 2 – Mar 29, 31 sap days3120042004: Feb 24 – Mar 25, 43 sap days4320032003: Mar 8 – Apr 10, 26 sap days2620022002: Mar 5 – Apr 7, 50 sap days5020012001: Mar 6 – Apr 5, 27 sap days2720002000: Feb 3 – Mar 7, 41 sap days4119991999: Feb 26 – Mar 30, 48 sap days4819981998: Feb 21 – Mar 25, 37 sap days3719971997: Mar 1 – Apr 2, 37 sap days3719961996: Mar 11 – Apr 15, 42 sap days4219951995: Feb 21 – Mar 27, 35 sap days3519941994: Mar 7 – Apr 8, 40 sap days4019931993: Mar 11 – Apr 13, 33 sap days3319921992: Mar 6 – Apr 7, 42 sap days4219911991: Feb 20 – Mar 20, 36 sap days36
Each bar runs from the season's opening signal to its closing signal, estimated from daily temperatures at Flint. Dashed lines mark the typical dates. The right column counts freeze-thaw sap days from December through May.

Maple production

Genesee County in the Census of Agriculture

USDA counts maple operations every five years. In Genesee County the 2022 Census found 8 farms making syrup (-33% since 2017), with taps -10% and syrup output -34% over the same five years. That works out to about 0.13 gallons of syrup per tap in 2022 (0.17 in 2017). Among the 385 counties in this atlas, Genesee County ranks 243 by taps.

Genesee County maple production, 2017 and 2022 (USDA Census of Agriculture)
Census yearFarmsTapsGallons of syrupGal / tap
202282,3533000.13
2017122,6044530.17

Nearby

Neighboring maple counties

Distances are between reference towns; typical dates are each county's own estimate.

About these numbers

The season dates are estimated from 36 seasons of daily high and low temperatures for the PRISM 4-km grid cell at Flint (755ft), scored with the same freeze-thaw rule as our live forecast: a sap day is an overnight low under 30.2 °F followed by an afternoon high over 37.4 °F. Each season's closing signal is the last sap day before accumulated warmth reaches a threshold, and the opening signal sits five weeks before that, never earlier than the first real freeze-thaw week. Tested against 117 state-seasons of USDA-reported dates, the rule lands within 5.5 days of the reported close and 6.6 days of the reported opening on average, and the typical dates shown here are scaled to Michigan's USDA record (12 years). Production figures are copied from the Census as published. Full method, calibration tables and the downloadable dataset →

Sources · 6

  1. 1.2022 Census of Agriculture, County Level Data — Michigan, Table 37: Maple Syrup, 2022 and 2017 · USDA National Agricultural Statistics Service
  2. 2.PRISM daily temperature grids (AN81d, 4 km), accessed 2026-10-05 · PRISM Group, Oregon State University, https://prism.oregonstate.edu
  3. 3.Applied Climate Information System (ACIS) web services · NOAA Regional Climate Centers
  4. 4.USDA NASS maple syrup reports — approximate average season opened and closed dates, 2011–2022 · USDA National Agricultural Statistics Service (mirrored by the University of Vermont)
  5. 5.Sap flow in sugar maple: timing and weather drivers (Frontiers in Agronomy, 2025) · de Lima Santos et al.
  6. 6.GeoNames gazetteer (cities500), CC BY 4.0 · GeoNames

FAQ

Genesee County sugaring questions

When should I tap maple trees in Genesee County, Michigan?
In a typical year the sap starts running around February 24 near Flint and the season winds down around March 28. Have your taps in a day or two before the first forecast string of freezing nights and 40 °F days. In the past 36 seasons the weather signal came as early as Feb 1 and as late as Mar 15.
How much maple syrup does Genesee County produce?
The 2022 Census of Agriculture counted 8 maple operations in Genesee County with 2,353 taps producing 300 gallons of syrup, ranking 46 of 66 Michigan's counties with published tap counts.
How many sap days does Genesee County get in a season?
On average 39.1 freeze-thaw sap days from December through May at Flint, of which about 13.8 are textbook days with a night in the 20s and a day in the 40s. The best season since 1991 was 2018 (56 sap days); the leanest was 2003 (26).
Where do these dates come from?
From 36 seasons of daily high and low temperatures at Flint (PRISM 4-km grid), scored with the same freeze-thaw rule as our live forecast, then calibrated against USDA's reported season dates for Michigan. They describe a typical year at one point in the county; your sugarbush, slope and elevation can shift them by days.

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