Frost Dates: First and last frost dates for Grand Haven Fire Dept, MI

ℹ️ How to read these charts for the spring

As spring unfolds, the risk of frost gradually decreases each day until your tender plants are finally safe. The probabilities shown in the chart help you make smart decisions about when to plant.

While frost typically forms at 32°F, tender plants can be damaged even when temperatures are slightly higher. Air temperatures are often measured several feet above the ground, but temperatures at plant level can be several degrees colder. Protected areas like porches help by blocking radiational cooling. Given these variables, we consider 36°F the "caution zone" for frost-sensitive plants.

Key dates for your spring planting:

  • By May 21, you have a 90% chance of being frost-free — this is your "safe date" for planting tender crops
  • Around May 6, there's a 50/50 chance of frost — check weather forecasts carefully if planting now
  • Before April 26, there's still an 80% risk of frost — too early for tomatoes and other tender plants unless you're prepared to protect them

If the 10-day forecast shows no temperatures below 40°F, you might safely plant earlier than the above dates suggest. Many gardeners watch for this weather window to get a head start on the growing season.

In the Spring
Temperature 10% 20% 30% 40% 50% 60% 70% 80% 90%
Last 16° Mar 30 Mar 25 Mar 21 Mar 17 Mar 14 Mar 11 Mar 8 Mar 4 Feb 27
Last 20° Apr 9 Apr 4 Mar 31 Mar 28 Mar 25 Mar 22 Mar 19 Mar 16 Mar 11
Last 24° Apr 14 Apr 10 Apr 7 Apr 5 Apr 3 Mar 31 Mar 29 Mar 26 Mar 22
Last 28° Apr 27 Apr 21 Apr 18 Apr 15 Apr 12 Apr 9 Apr 6 Apr 2 Mar 28
Last 32° May 11 May 7 May 3 Apr 30 Apr 28 Apr 25 Apr 22 Apr 18 Apr 14
Last 36° May 21 May 16 May 12 May 9 May 6 May 3 Apr 30 Apr 26 Apr 21

ℹ️ How to read these charts for the fall

As summer ends in Grand Haven Fire Dept, MI, nighttime temperatures begin to drop, and your risk of frost increases with each passing day. Knowing when to expect frost helps you harvest sensitive crops and extend your growing season with protection methods.

The chart below shows the probability of experiencing specific temperatures on various dates. Here's what this means for your garden:

1
Early warning: Around October 12, there's a 20% chance of 32°F — start monitoring forecasts and have plant covers ready
2
Decision time: By October 22, there's a 50% chance of frost — harvest tomatoes, peppers, and other tender crops or prepare protection
3
Last chance: By November 1, there's an 80% chance of seeing 32°F — most tender plants will be damaged without protection
4
Another perspective: You have only a 1 in 5 chance of making it past November 1 without a freezing night

These probabilities help you time your end-of-season harvests and know when to apply protective measures like row covers, cloches, or cold frames to extend your harvest.

In the Fall
Temperature 10% 20% 30% 40% 50% 60% 70% 80% 90%
First 16° Nov 23 Nov 30 Dec 4 Dec 8 Dec 12 Dec 15 Dec 19 Dec 24 Dec 30
First 20° Nov 16 Nov 22 Nov 26 Nov 29 Dec 3 Dec 6 Dec 9 Dec 13 Dec 19
First 24° Nov 7 Nov 13 Nov 16 Nov 20 Nov 23 Nov 26 Nov 29 Dec 3 Dec 8
First 28° Oct 18 Oct 24 Oct 28 Oct 31 Nov 4 Nov 7 Nov 10 Nov 14 Nov 20
First 32° Oct 6 Oct 12 Oct 15 Oct 19 Oct 22 Oct 25 Oct 28 Nov 1 Nov 6
First 36° Sep 27 Oct 1 Oct 5 Oct 7 Oct 10 Oct 13 Oct 15 Oct 19 Oct 23

📍 Frost Dates for other nearby locations

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Data is provided by the NOAA National Centers for Environmental Information.