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Indiana · county maple atlas

Maple sugaring in Harrison County, Indiana

Harrison County had 7 maple operations and 530 taps in the 2022 Census. Around Corydon, sap usually runs from January 14 to February 13. Here's the long-run pattern, 36 seasons of sap weather, and the outlook this week.
Too early to tapAbout 100 days until the usual start.
Sap starts
Jan 14
typical year
Season ends
Feb 13
about 4 weeks
Sap days / season
44.2
1991–2026 average
Taps, 2022
530
#21 of 42 in IN

Sap-flow outlook at Corydon right now

Full Indiana forecast →

Forecast for Corydon, IN

Updated Oct 6, 9:56 AM EDT

Off-season for now. Sap needs freezing nights, and none are in sight. Harrison County's season usually opens around January 14, which is 100 days away.

No freeze-thaw days in the forecast

freeze thaw 32°F

  1. WedOct 7
    46° / 81°

    0h below · 24h above

    No refreeze forecast
  2. ThuOct 8
    52° / 81°

    0h below · 24h above

    No refreeze forecast
  3. FriOct 9
    47° / 77°

    0h below · 24h above

    No refreeze forecast
  4. SatOct 10
    49° / 81°

    0h below · 24h above

    No refreeze forecast
  5. SunOct 11
    55° / 73°

    0h below · 24h above

    No refreeze forecast
  6. MonOct 12
    54° / 80°
    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 Corydon

Freeze-thaw weather at Corydon peaks in the weeks of Jan 5 to Mar 9, which hold about 62% of a season's sap days. January is the busiest month.
Typical season: Jan 14 – Feb 130246Week of Dec 1: 2.5 sap days on averageWeek of Dec 8: 2.7 sap days on averageWeek of Dec 15: 2.7 sap days on averageWeek of Dec 22: 2.3 sap days on averageWeek of Dec 29: 1.9 sap days on averageWeek of Jan 5: 2.3 sap days on averageWeek of Jan 12: 2.4 sap days on averageWeek of Jan 19: 2.7 sap days on averageWeek of Jan 26: 3.3 sap days on averageWeek of Feb 2: 2.9 sap days on averageWeek of Feb 9: 3.0 sap days on averageWeek of Feb 16: 2.6 sap days on averageWeek of Feb 23: 2.8 sap days on averageWeek of Mar 2: 2.8 sap days on averageWeek of Mar 9: 2.3 sap days on averageWeek of Mar 16: 1.7 sap days on averageWeek of Mar 23: 1.5 sap days on averageWeek of Mar 30: 0.8 sap days on averageWeek of Apr 6: 0.6 sap days on averageWeek of Apr 13: 0.2 sap days on averageWeek of Apr 20: 0.0 sap days on averageWeek of Apr 27: 0.0 sap days on averageWeek of May 4: 0.0 sap days on averageWeek of May 11: 0.0 sap days on averageWeek of May 18: 0.0 sap days on averageWeek of May 25: 0.0 sap days on averageDecJanFebMarAprMaytaps in ~Jan 14
Average number of freeze-thaw sap days in each week of the season at Corydon, 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 Jan 18; the middle half of seasons fell between Jan 13 and Jan 22. Earliest Jan 4 (2002), latest Feb 8 (2003).
Closing signal
Median Feb 18; middle half between Feb 8 and Feb 25. Earliest Jan 16 (2023), latest Mar 12 (2003).
Sap days by month
Dec25%Jan26%Feb26%Mar20%Apr3%May0%

36 seasons of sap weather

Harrison County seasons, 1991–2026

The best sap year at Corydon was 2013 with 57 freeze-thaw days; the leanest was 2011 with 32. 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: Jan 16 – Feb 17, 38 sap days3820252025: Jan 29 – Mar 4, 39 sap days3920242024: Jan 5 – Feb 8, 40 sap days4020232023: Jan 7 – Jan 16, 39 sap days3920222022: Jan 27 – Mar 1, 51 sap days5120212021: Jan 29 – Mar 5, 52 sap days5220202020: Jan 5 – Jan 30, 40 sap days4020192019: Jan 22 – Feb 3, 48 sap days4820182018: Jan 19 – Feb 18, 44 sap days4420173720162016: Jan 17 – Feb 19, 39 sap days3920152015: Feb 7 – Mar 9, 39 sap days3920142014: Feb 5 – Mar 10, 54 sap days5420132013: Jan 7 – Feb 10, 57 sap days5720122012: Jan 4 – Jan 30, 47 sap days4720112011: Jan 22 – Feb 24, 32 sap days3220102010: Feb 4 – Mar 8, 38 sap days3820092009: Jan 22 – Feb 25, 38 sap days3820082008: Jan 12 – Feb 4, 43 sap days4320072007: Jan 18 – Feb 20, 40 sap days4020062006: Jan 15 – Jan 19, 46 sap days4620054220042004: Jan 26 – Mar 1, 56 sap days5620032003: Feb 8 – Mar 12, 38 sap days3820022002: Jan 4 – Feb 8, 53 sap days5320012001: Jan 20 – Feb 24, 48 sap days4820002000: Jan 14 – Feb 18, 39 sap days3919991999: Jan 11 – Jan 27, 49 sap days4919981998: Jan 14 – Jan 29, 39 sap days3919971997: Jan 15 – Feb 18, 39 sap days3919961996: Jan 19 – Feb 19, 47 sap days4719951995: Jan 18 – Feb 22, 41 sap days4119941994: Jan 19 – Feb 18, 48 sap days4819931993: Jan 17 – Feb 21, 51 sap days5119921992: Jan 12 – Feb 11, 56 sap days5619911991: Jan 15 – Feb 17, 45 sap days45
Each bar runs from the season's opening signal to its closing signal, estimated from daily temperatures at Corydon. Dashed lines mark the typical dates. The right column counts freeze-thaw sap days from December through May.

Maple production

Harrison County in the Census of Agriculture

USDA counts maple operations every five years. In Harrison County the 2022 Census found 7 farms making syrup (+600% since 2017). That works out to about 0.09 gallons of syrup per tap in 2022. Among the 385 counties in this atlas, Harrison County ranks 313 by taps.

Harrison County maple production, 2017 and 2022 (USDA Census of Agriculture)
Census yearFarmsTapsGallons of syrupGal / tap
20227530490.09
20171withheldwithheld—

“Withheld” means USDA suppressed the figure to avoid disclosing data for individual operations; the farm count is still published.

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 Corydon (669ft), 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 Indiana's USDA record (3 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 — Indiana, 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

Harrison County sugaring questions

When should I tap maple trees in Harrison County, Indiana?
In a typical year the sap starts running around January 14 near Corydon and the season winds down around February 13. 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 Jan 4 and as late as Feb 8.
How much maple syrup does Harrison County produce?
The 2022 Census of Agriculture counted 7 maple operations in Harrison County with 530 taps producing 49 gallons of syrup, ranking 21 of 42 Indiana's counties with published tap counts.
How many sap days does Harrison County get in a season?
On average 44.2 freeze-thaw sap days from December through May at Corydon, of which about 12.8 are textbook days with a night in the 20s and a day in the 40s. The best season since 1991 was 2013 (57 sap days); the leanest was 2011 (32).
Where do these dates come from?
From 36 seasons of daily high and low temperatures at Corydon (PRISM 4-km grid), scored with the same freeze-thaw rule as our live forecast, then calibrated against USDA's reported season dates for Indiana. 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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