DATA
We meticulously keep data sheets for each night that frogs move. Below are recaps derived from those sheets.
Note that whether frogs move or not on any given night is up to the weather and the frogs. They move after dark on wet, rainy (or at least misty) nights when it is above 44 degrees. They don’t start moving until the females’ eggs are developed and both sexes are feeling the biological urge to head for the wetland. In most years, that urge hits sometime during the first half December.
2024-25 Season Recap
Number of frogs assisted downhill from Forest Park to the Harborton Wetlands: 1,682
No. of males assisted downhill: 688
No. of females assisted downhill: 994
Number of frogs assisted uphill: 1979
No. of males assisted uphill: 478
No. of females assisted uphill: 1,501
Number of nights of movement: 37
Peak nights (>25): 18
No of hours volunteers were on site: 141
Total no. of volunteer hours : 778
First night of downhill movement: Dec. 15
Last night of downhill movement: Feb. 23
First night of uphill movement: Jan. 5
Last night of uphill movement: Mar 27
Peak nights for 2024-25 (More than 25 frogs )
12/17 205 down
12/18 29 down
12/22 95 down
12/23 35 down
12/27 65 down
1/4 203 down
1/5 430 down
19 up
1/31 117 down
77 up
2/17 339 down
02 up
2/19 18 down
266 up
2/23 10 down
47 up
3/9 65 up
3/11 60 up
3/12 48 up
2023-24 Season Recap
Number of frogs assisted downhill from Forest Park to the Harborton Wetlands: 1591
No. of males assisted downhill: 1433
No. of females assisted downhill: 158
Number of frogs assisted uphill: 577
No. of males assisted uphill: 495
No. of females assisted uphill: 82
Number of nights of movement: 35
Peak nights (>25): 13
No of hours volunteers were on site: 143
Total no. of volunteer hours : 817
First night of downhill movement: Dec. 3
Last night of downhill movement: Feb. 20
First night of uphill movement: Feb. 12
Last night of uphill movement: Mar 25
2022-23 Season Recap
Number of RL frogs that moved downhill from Forest Park to the Harborton Wetlands (including unassisted): 1231
Number assisted downhill: 1224
No. of males assisted downhill: 1134
No. of females assisted downhill: 90
Number of RL frogs that moved uphill (including unassisted): 944
Number of RL frogs assisted uphill: 915
No. of males assisted uphill: 791
No. of females assisted uphill: 124
Number of nights of movement: 34
Peak nights (>25): 13
No of hours we were on site: 146
Total no. of volunteer hours : 559
First night of downhill movement: Dec. 11
Last night of downhill movement: Mar. 26
First night of uphill movement: Mar. 11
Last night of uphill movement: Apr. 8
Winter 2021-22
376 frogs transported to wetland (see Blog “Late Night”)
139 males, 271 females
289 frogs transported to forest
28 males, 147 females
Winter 2020-21
423 frogs transported to wetland (see Blog “Late Night”)
139 males, 271 females
193 frogs transported to forest
28 males, 147 females
Winter 2019-20
2006 frogs transported to wetland
1180 males, 811 females
475 frogs transported to the forest (frog season cut short by covid pandemic, ie. low number)
89 males, 386 females
Winter 2018-19
1224 frogs transported to wetland
1134 males, 90 females, (though PGE subsequently counted about 165 egg masses, a more accurate female count)
915 frogs transported to the forest
791 males, 124 females
Winter 2017-18
416 frogs transported to wetland
281 males, 135 females
269 frogs transported to forest
165 males, 104 females
Winter 2016-17
805 frogs transported to wetland - first migration: November 14
340 males, 465 females
730 frogs transported to forest
343 males, 387 females
Winter 2015-16
688 frogs transported to wetland - first migration: December 7
1016 frogs transported to forest - First migration: January 19
Winter 2014-15
704 frogs transported to wetland - first migration: December 20
241 males, 463 females
721 frogs transported to forest
198 males, 523 females
WinterWinter 2013-14
572 Northern red-legged frogs transported to wetland - first migration: January 7
226 males, 346 females, 352 egg masses counted
542 frogs transported back to forest - first migration: February 15
162 males, 380 females