Grand Rapids area apple maturity report – September 16, 2026
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EmailHarvest continues on Galas and Honeycrisp, with more varieties ready.
Apple maturity testing will occur weekly for the Grand Rapids/Ridge region beginning now through the end of harvest. Reports will be sent out every week following the Michigan State University Extension fruit team apple maturity calls on Wednesday mornings.
In the Grand Rapids Ridge region, Gala, Honeycrisp and some Red Delicious are being harvested this week. Gala and Honeycrisp are mature this week, and some have become overmature. Reds and Golden are ready in some locations.
How to read maturity tables
Each week, an apple maturity report will be provided and will include average values for several apple samples for varieties nearing maturity. Maximum and minimum values are included in tables below for the highest and lowest individual fruits evaluated for each, to give a full spectrum of maturity. Samples included in the reports have been untreated with ReTain or Harvista, unless otherwise noted. Samples were collected from 2-5 locations across Kent and Ottawa counties.
For more information about apple maturity testing, review these resources compiled by the MSU Extension tree fruit team.
- Predicted apple harvest dates for 2026 from MSU.
- More information on harvest management tools and timings can be found in this article.
- Guidelines from MSU to check for apple maturity in your own orchard, including specific pressure and starch recommendations by variety.
- New starch charts for evaluating apple maturity in Michigan from Michigan State University
- Predicting apple maturity and starch chart from Cornell University.
- Starch chart for Honeycrisp Apples developed by Washington State University.
Harvest
Apple harvest has begun on a few early varieties like Wildfire Gala, Premiere Honeycrisp and Maia. The Predicted harvest date for Gala is Aug. 25, so maturity sampling should have already begun or start now. Double check prediction dates and PHIs before applying Retain and Harvista.
Maturity information for the Grand Rapids/Ridge Region
Gala
Gala fruit were sampled from two locations in Kent and Ottawa County this week. Samples in the table below are for Brookfield galas. Red color is at 87%. Background color is yellow at 1.1. Fruit firmness is at 17.4 lbs. of pressure. Starch is an average of 4.1. Sugars are an average of 11.4 Brix.
|
Collection Date |
Fruit Weight (g) |
Red Color (%) |
Background color (5-1) |
Firmness (lbs) |
Starch (1-8) |
Soluble Solids (Brix) |
|
Aug 18 |
291 (309-279) |
78 (99-45) |
1.9 (4-1) |
21.1 (26-18) |
1.5 (3-1) |
9.5 (11-8) |
|
Aug 24 |
325.25 (349-302) |
74.525 (100-40) |
1.85 (3-1) |
20.555 (22.8-17.7) |
1.95 (4-1) |
9.85 (10.3-9.6) |
|
Sep 1 |
382.5 (400-362) |
80 (100-40) |
1.1 (2-1) |
18.955 (24.2-16.3) |
3.6 (7-1) |
10.85 (11.2-10.2) |
|
Sep 9 |
392.5 (400-380) |
86.375 (100-50) |
1.1 (2-1) |
17.4 (19.4-15.5) |
4.1 (6-2) |
11.38 (12-10.6) |
|
Sep 16 |
370 (370-355) |
90 (100-60) |
1 (2-1) |
17.8 (20-14.8) |
5.4 (8-3) |
14 (14-11) |
In some Gala blocks, as well as in Golden Delicious, I am noticing leaf yellowing followed by a leaf drop. I began seeing it last week. This is likely a physiological disorder called necrotic leaf blotch that causes the leaves to develop brownish blotches, followed by chlorosis or yellowing of the leaves, and then defoliation.
Red Delicious
Fruit were sampled from three locations in Kent County. Red color is at 84%. Background color is mostly yellow, and fruit range from almost mature to mature depending on site. Average pressure is 18 lbs, and starch rating averaged at 1.8. Sugars are at 10.1 Brix. Some locations of red could likely be picked, but I expect most to come into maturity next week.
|
Collection Date |
Fruit Weight (g) |
Red Color (%) |
Background color (5-1) |
Firmness (lbs) |
Starch (1-8) |
Soluble Solids (Brix) |
|
Sep 9 |
376.7 (390-350) |
81.5 (90-60) |
2.2 (3-1) |
17.14 (21.3-14.8) |
2.3 (7-1) |
9.9 (10-9.5) |
|
Sep 16 |
379.7 (420-350) |
83.7 (100-50) |
1.5 (3-1) |
18.52 (19-16) |
1.8 (6-1) |
10.1 (10-10) |
Ambrosia
Ambrosia were sampled from three locations in Kent County this week. Fruit is still slightly immature overall. Red color is at 54.3%. Background color is yellow at 2.9. Fruit firmness is at 17.12 lbs. of pressure. Starch is an average of 3.2, and sugars are an average of 11.8 Brix.
|
Collection Date |
Fruit Weight (g) |
Red Color (%) |
Background color (5-1) |
Firmness (lbs) |
Starch (1-8) |
Soluble Solids (Brix) |
|
Aug 24 |
293 (293-290) |
31.5 (50-20) |
5 (5-5) |
22.8 (26.2-18.2) |
1 (1-1) |
10.5 (10.5-9.1) |
|
Sep 14 |
370 (400-330) |
54.3 (90-30) |
2.9 (4-2) |
17.12 (22-13.1) |
3.2 (8-1) |
11.8 (12.3-10.3) |
Fuji
Fuji were sampled from three locations in Kent County this week. Fruit is still immature. Red color is at 50%. Background color is yellow at 3.2. Fruit firmness is at 19.1 lbs. of pressure. Starch is an average of 2, and sugars are an average of 10.6 Brix.
|
Collection Date |
Fruit Weight (g) |
Red Color (%) |
Background color (5-1) |
Firmness (lbs) |
Starch (1-8) |
Soluble Solids (Brix) |
|
Aug 31 |
316 (340-293) |
51.2 (90-35) |
4.9 (5-4) |
20.6 (23.4-18.5) |
1.2 (1-1) |
9.7 (9.8-9) |
|
Sep 14 |
388 (450-290) |
49.2(80-25) |
3.2 (4-2) |
19.1 (24.8-16.2) |
2 (3-1) |
10.6 (10.1-10.1) |
Golden Delicious
Goldens were sampled from two locations in Kent County this week. Fruit was mostly immature, but some fruit had reached maturity. Blush is at 6%. Background color is yellow at 4.2. Fruit firmness is at 16.1 lbs. of pressure. Starch is an average of 3.2, and sugars are an average of 11.9 Brix.
|
Collection Date |
Fruit Weight (g) |
Red Color (%) |
Background color (5-1) |
Firmness (lbs) |
Starch (1-8) |
Soluble Solids (Brix) |
|
Sep 16 |
316 (340-293) |
6 (8.5-3) |
4.2 (5-3) |
16 (17.5-13.8) |
3.2 (6-2) |
11.9 (12.3-11.5) |
Apple maturity sampling parameters
- Color % = the visual percentage of red color from 0 to 100; range is of all fruits tested. Indicates surface area covered in red and intensity of red color.
- Background color: 5 = Green, 1 = Yellow; range is of all fruits tested.
- Firmness in pounds pressure = measured with a Güss Fruit Texture Analyzer; range is of all fruits tested.
- Starch For Honeycrisp: will typically be rated using the standard Michigan State University starch scale (1-8). However, a separate starch chart for Honeycrisp Apples developed by Washington State University (scale 1-6) also exists.
- Brix = % sugar measured with Atago PAL-1 Pocket Refractometer
Looking for more? View Michigan State University Extension’s Apple page for regional reports throughout the state and additional resources.
|
Suggested firmness and starch index levels for long-term and shorter-term controlled atmosphere (CA) storage by variety. |
|||||
|
Variety |
Firmness (pounds)* |
Starch Index* |
|||
|
Short CA |
Mid-CA |
Long CA |
Mature |
Over mature |
|
|
McIntosh |
14 |
15 |
16 |
5 |
7 |
|
Gala |
16 |
17 |
18 |
3 |
6 |
|
Honeycrisp |
15 |
16 |
17 |
3.5 |
6 |
|
Empire |
14 |
15 |
16 |
3.5 |
6 |
|
Early Fuji |
16 |
17 |
18 |
3 |
7 |
|
Jonagold |
15 |
16 |
17 |
3.5 |
5.5 |
|
Jonathan |
14 |
15 |
16 |
3.5 |
5.5 |
|
Golden Delicious |
15 |
16 |
17 |
3 |
6.5 |
|
Red Delicious |
16 |
17 |
18 |
2.5 |
6 |
|
Idared |
14 |
15 |
16 |
3.5 |
6 |
|
Fuji |
16 |
17 |
18 |
3 |
7 |
|
Rome |
15 |
16 |
18 |
3 |
5.5 |
|
Brix Guide |
Low |
Fair |
Good |
Excellent |
|
All varieties |
Less than 11 |
11 |
12 |
13 |
|
Honeycrisp |
Less than 12 |
12 |
12 |
Greater than 14 |