Frost Dates: First and last frost dates for Idleyld Park, 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 29, you have a 90% chance of being frost-free — this is your "safe date" for planting tender crops
- Around June 7, there's a 50/50 chance of frost — check weather forecasts carefully if planting now
- Before May 24, 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° | Feb 5 | Jan 21 | Jan 6 | Dec 15 | -- | -- | -- | -- | -- |
| Last 20° | Feb 13 | Feb 1 | Jan 23 | Jan 15 | Jan 7 | Dec 29 | Dec 17 | -- | -- |
| Last 24° | Mar 16 | Mar 4 | Feb 24 | Feb 17 | Feb 10 | Feb 3 | Jan 27 | Jan 17 | Jan 4 |
| Last 28° | Apr 27 | Apr 16 | Apr 8 | Apr 1 | Mar 26 | Mar 20 | Mar 13 | Mar 5 | Feb 22 |
| Last 32° | Jun 8 | May 31 | May 25 | May 21 | May 16 | May 12 | May 7 | May 1 | Apr 24 |
| Last 36° | Jun 29 | Jun 22 | Jun 16 | Jun 11 | Jun 7 | Jun 3 | May 29 | May 24 | May 16 |
ℹ️ How to read these charts for the fall
As summer ends in Idleyld Park, 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 17 | Jan 5 | Jan 24 | -- | -- | -- | -- | -- | -- |
| First 20° | Nov 23 | Dec 6 | Dec 15 | Dec 23 | Jan 1 | Jan 10 | Jan 25 | -- | -- |
| First 24° | Nov 7 | Nov 17 | Nov 25 | Dec 1 | Dec 7 | Dec 14 | Dec 20 | Dec 29 | Jan 10 |
| First 28° | Oct 12 | Oct 21 | Oct 28 | Nov 3 | Nov 8 | Nov 13 | Nov 19 | Nov 26 | Dec 5 |
| First 32° | Sep 11 | Sep 18 | Sep 24 | Sep 29 | Oct 3 | Oct 8 | Oct 12 | Oct 18 | Oct 26 |
| First 36° | Aug 27 | Sep 3 | Sep 8 | Sep 12 | Sep 16 | Sep 20 | Sep 24 | Sep 29 | Oct 6 |
📍 Frost Dates for other nearby locations
- Toketee Falls, OR 23.5 mi
- Cottage Grove Dam, OR 32.7 mi
- Dorena, OR 33.4 mi
- Cottage Grove, OR 35.9 mi
- Oakridge Fish Hatchery, OR 36.9 mi
- Lookout Point Dam, OR 40.3 mi
- Roseburg Kqen, OR 41.1 mi
- Drain, OR 44.0 mi
- Prospect, OR 45.4 mi
- Lost Creek Dam, OR 46.4 mi
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Data is provided by the NOAA National Centers for Environmental Information.