Mushroom harvest timeline tracker
Enter your start date and see the seller's stated windows for pins, first harvest and a second flush, as real dates.
FreeNo sign-upRuns in your browser
Enter a start date and press Show my dates.
Where the day counts come from
For a Spray & Grow kit, North Spore says pinning typically begins 6 to 10 days after activation and a full flush follows in about 4 to 5 days. That makes the first harvest window day 10 to day 15. It says new pins on a second flush take about 2 to 3 weeks, and to reboot the block if there is no progress 2 to 3 weeks after the first flush.
For a shiitake fruiting block, North Spore's booklet says the block browns in its bag for about 1 to 2 months, is chilled for at least 48 hours, soaked for about 4 hours, and then fruits in 1.5 to 2 weeks in the chamber. We counted a month as 30 days and 1.5 weeks as 11 days to turn those into dates.
What the tool does with your dates
It adds the seller's day ranges to the dates you enter, in your browser. Nothing is sent anywhere. If your browser allows it, the page remembers your dates on this device so you can come back, and the "clear saved dates" button removes them. A cool or dry room can slow a kit, so use the dates as a guide and check the kit every morning. The signs for picking are in when to harvest oyster mushrooms, and the growing method is in how to grow mushrooms at home.
Related pages
Common questions
How long until my Spray & Grow kit makes mushrooms?
North Spore says pins typically begin 6 to 10 days after activation, and a full flush follows in about 4 to 5 days. That is a first harvest between day 10 and day 15.
When should I expect a second flush?
North Spore says new pins take about 2 to 3 weeks after the first flush, and to reboot the block if there is no progress in that time.
Why does a shiitake block take so long?
North Spore's booklet says the block browns in its bag for about 1 to 2 months before you chill and soak it. After that it fruits in 1.5 to 2 weeks in a chamber.
Does the tracker store my dates?
Only in your own browser, if it allows it, so the page can show them next time. Nothing is sent to us. The clear button removes them.
Sources
- Using a Spray & Grow Kit, North Spore. Checked November 11, 2026.
- Spray & Grow Kit FAQ, North Spore. Checked November 11, 2026.
- Fruiting Block Kit Instruction Booklet (PDF), North Spore. Checked November 11, 2026.
- Shiitake Ready-To-Fruit Blocks, instruction sheet, Field & Forest. Checked November 11, 2026.
How this page is checked
Cedrick Reese built this tracker from North Spore's Spray & Grow guide and fruiting block booklet. It adds the seller's stated day counts to your dates and does nothing else, and the page says where we rounded a month or a week into days. We have not timed a kit ourselves, so the dates are the sellers' figures and not our results.