Predicted 2020 apple harvest dates

The predicted apple harvest dates are a few days later than normal.

Apples
Photo by Amy Irish-Brown, MSU Extension

The predicted harvest dates are now available at all locations on the Michigan State University Enviroweather website. Once again, we have experienced a cool to cold late winter climate that delayed the development of spring buds. Most of the state experienced a late bloom except the very southeast part of Michigan. In general, 2020 predicted harvest dates are a few days later than normal. Most of the state is only a few days behind normal and nearly equal to last year or a few days ahead of last year.

As always, the weather seems to be unusual each year and 2020 was no different. A severe freeze with no inversion occurred on May 9. This year began with another late spring. Most areas bloomed a week late except southeast Michigan, which was a few days late. Warm weather returned mid- to late May, which sped up bloom. In general, apple blocks have a mix of cropload, some light and some heavy areas but mostly moderate crop loads. Blocks with light crop loads will mature three or four days sooner then the predicted harvest dates. Heavy crop loads will mature seven days later than the predicted dates. If hot stressful weather occurs in August or September, apple maturity will be advanced. The 2020 predicted harvest dates are listed in Table 1. This year, we are nearly normal to a few days later than normal. Table 2 lists this year’s predictions compared to normal and last year.

The normal harvest dates for other varieties are listed in Table 3 for the Grand Rapids area. This year's 2020 predicted dates for other non-modeled varieties are a rough estimate based on the McIntosh, Jonathan and Red Delicious predicted dates. Other areas of the state should adjust non-predicted varieties based on their own history. ReTain application should be applied 30 DBH (days before harvest). Harvista can be applied three to seven DBH. Use Table 3, 2020 Predicted Harvest Dates for Other Varieties, to time ReTain applications and adjust for varieties and locations.

Table 1. 2020 predicted peak harvest dates.

Full bloom date 2020

Predicted harvest date 2020

Station

McIntosh

Jons

Reds

McIntosh

Jons

Reds

Observer

SWMREC

16-May

17-May

17-May

10-Sep

24-Sep

30-Sep

Shane

Deerfield

10-May

14-May

14-May

9-Sep

23-Sep

5-Oct

Tritten

Romeo

20-May

21-May

22-May

18-Sep

29-Sep

5-Oct

Tritten

Peach Ridge

21-May

22-May

22-May

19-Sep

30-Sep

6-Oct

Irish-Brown

Hart

25-May

25-May

26-May

24-Sep

5-Oct

12-Oct

Irish-Brown

NWMHRS

27-May

28-May

28-May

27-Sep

11-Oct

19-Oct

Rothwell

Table 2. 2020 predicted peak harvest dates compared to normal and last year.

Days behind normal

Days behind of last year

Station

McIntosh

Jons

Reds

McIntosh

Jons

Reds

SWMREC

-3

3

-2

0

0

0

Deerfield

-1

2

-3

0

0

0

Romeo

5

4

2

2

-2

-2

Peach Ridge

3

4

-1

0

0

0

Hart

8

2

2

-2

-5

-5

NWMHRS

5

5

2

-3

0

-2

               

 


Table 3. Normal and 2020 peak harvest dates for varieties for the Grand Rapids area

Variety

Normal date

2020 predicted date

Paulared

8/24

8/28

Gingergold

8/26

8/30

Gala

9/10

9/14

McIntosh

9/15

9/19

Honeycrisp

9/18

9/23

Empire

9/24

9/28

Jonathan

9/26

9/30

Jonagold

9/26

9/30

Golden Delicious

10/2

10/2

Red Delicious

10/5

10/6

Idared

10/10

10/11

Rome

10/15

10/16

Fuji

10/25

10/26

Braeburn

10/25

10/26

Goldrush

11/1

11/2

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