Frost Dates: First and last frost dates for Mc Minnville, OR
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 June 21, you have a 90% chance of being frost-free — this is your "safe date" for planting tender crops
- Around May 22, there's a 50/50 chance of frost — check weather forecasts carefully if planting now
- Before May 3, 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.
| Temperature | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| Last 16° | Jan 28 | Jan 14 | Jan 2 | Dec 17 | -- | -- | -- | -- | -- |
| Last 20° | Feb 20 | Feb 8 | Jan 30 | Jan 21 | Jan 13 | Jan 3 | Dec 20 | -- | -- |
| Last 24° | Feb 27 | Feb 16 | Feb 8 | Feb 1 | Jan 25 | Jan 19 | Jan 11 | Jan 2 | Dec 15 |
| Last 28° | Apr 28 | Apr 14 | Apr 5 | Mar 28 | Mar 20 | Mar 12 | Mar 4 | Feb 23 | Feb 10 |
| Last 32° | May 23 | May 13 | May 5 | Apr 29 | Apr 23 | Apr 16 | Apr 10 | Apr 2 | Mar 23 |
| Last 36° | Jun 21 | Jun 11 | Jun 3 | May 28 | May 22 | May 16 | May 10 | May 3 | Apr 22 |
ℹ️ How to read these charts for the fall
As summer ends in Mc Minnville, OR, 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:
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.
| Temperature | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| First 16° | Dec 18 | Jan 1 | Jan 13 | Jan 29 | -- | -- | -- | -- | -- |
| First 20° | Nov 30 | Dec 14 | Dec 24 | Jan 2 | Jan 11 | Jan 22 | Feb 7 | -- | -- |
| First 24° | Nov 11 | Nov 25 | Dec 6 | Dec 14 | Dec 23 | Dec 31 | Jan 10 | Jan 22 | Feb 14 |
| First 28° | Oct 22 | Nov 1 | Nov 8 | Nov 14 | Nov 19 | Nov 25 | Dec 1 | Dec 8 | Dec 18 |
| First 32° | Sep 30 | Oct 8 | Oct 14 | Oct 19 | Oct 24 | Oct 29 | Nov 3 | Nov 9 | Nov 17 |
| First 36° | Sep 18 | Sep 24 | Sep 28 | Oct 2 | Oct 6 | Oct 9 | Oct 13 | Oct 17 | Oct 23 |
📍 Frost Dates for other nearby locations
- Dallas, OR 19.3 mi
- Forest Grove, OR 22.8 mi
- Salem Ap Mcnary Fld, OR 25.2 mi
- Hillsboro, OR 25.5 mi
- Falls City #2, OR 29.2 mi
- N Willamette, OR 31.3 mi
- Silverton, OR 32.6 mi
- Stayton, OR 39.5 mi
- Corvallis State Univ, OR 39.9 mi
- Oregon City, OR 42.3 mi
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Data is provided by the NOAA National Centers for Environmental Information.