# Planting Schedule Validation for 2026-2027
## Climate Alignment Check

This document validates that all planting dates in `garden-plan-2026.csv` align with Western Zealand climate data from `climate-data-western-zealand.md`.

## Climate Parameters (Reference)
- **Last Spring Frost:** April 20
- **First Fall Frost:** October 10
- **Frost-Free Days:** 173 days
- **USDA Zone:** 8a-8b
- **Safe Greenhouse Start:** Mid-March onward

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## Validation Results ✓

### ✅ Early Spring (March-April)

| Date | Activity | Crop | Climate Check | Status |
|------|----------|------|---------------|--------|
| 2026-03-23 | Greenhouse Sow | Tomato | After mid-March safe start | ✓ SAFE |
| 2026-03-23 | Greenhouse Sow | Basil | After mid-March safe start | ✓ SAFE |
| 2026-04-13 | Direct Sow | Radicchio | Cold-hardy, before last frost OK | ✓ SAFE |
| 2026-04-13 | Direct Sow | Spinach | Cold-hardy, before last frost OK | ✓ SAFE |
| 2026-04-13 | Direct Sow | Peas | Cold-hardy, before last frost OK | ✓ SAFE |
| 2026-04-13 | Direct Sow | Carrots | Cold-hardy, before last frost OK | ✓ SAFE |
| 2026-04-13 | Direct Sow | Swiss Chard | Cold-hardy, before last frost OK | ✓ SAFE |
| 2026-04-13 | Transplant | Kale | Cold-hardy, before last frost OK | ✓ SAFE |

**Analysis:** All early spring sowings are appropriately timed. Greenhouse starts at March 23 provide ~6 weeks before transplant. Cold-hardy crops sown April 13 (1 week before last frost) is standard practice.

### ✅ Late Spring (May)

| Date | Activity | Crop | Climate Check | Status |
|------|----------|------|---------------|--------|
| 2026-05-04 | Transplant | Tomato | 2 weeks after last frost | ✓ SAFE |
| 2026-05-04 | Transplant | Basil | 2 weeks after last frost | ✓ SAFE |
| 2026-05-04 | Direct Plant | Cornflower | After last frost | ✓ SAFE |
| 2026-05-04 | Direct Sow | Bush Beans | After last frost, soil warm | ✓ SAFE |
| 2026-05-04 | Direct Sow | Zucchini | After last frost, soil warm | ✓ SAFE |
| 2026-05-04 | Direct Plant | Tansy | After last frost | ✓ SAFE |
| 2026-05-04 | Direct Sow | Carrots | After last frost | ✓ SAFE |
| 2026-05-18 | Direct Plant | Winter Squash | Soil definitely warm | ✓ SAFE |
| 2026-05-18 | Direct Plant | Wild Carrot | After last frost | ✓ SAFE |

**Analysis:** Perfect timing. May 4 is 2 weeks after last frost (April 20), giving safety margin for late cold snaps. Warm-season crops have warm soil. Second wave on May 18 ensures soil temperature ideal for squash.

### ✅ Summer (June-August)

| Date | Activity | Crop | Climate Check | Status |
|------|----------|------|---------------|--------|
| 2026-06-08 | Direct Sow | Bush Beans | Mid-season succession | ✓ SAFE |
| 2026-06-08 | Direct Sow | Swiss Chard | Mid-season succession | ✓ SAFE |
| 2026-07-06 | Direct Sow | Bush Beans | Late succession, 90+ days to frost | ✓ SAFE |
| 2026-07-06 | Direct Sow | Carrots | 90+ days to frost | ✓ SAFE |
| 2026-07-27 | Direct Sow | Kale (winter) | For fall/winter harvest | ✓ SAFE |
| 2026-07-27 | Direct Sow | Swiss Chard | For fall/winter harvest | ✓ SAFE |

**Analysis:** Succession plantings properly spaced. July 27 plantings for winter crops give 11 weeks before frost - adequate for kale/chard to establish before cold weather. Bush beans on July 6 have 96 days to October 10 first frost (beans need 50-60 days).

### ✅ Fall (September-November)

| Date | Activity | Crop | Climate Check | Status |
|------|----------|------|---------------|--------|
| 2026-10-05 | Direct Plant | Garlic | Traditional October planting | ✓ SAFE |
| 2026-10-26 | Direct Sow | Broad Beans | Overwinter variety, before hard freeze | ✓ SAFE |
| 2026-11-09 | Mulch | All beds | After first frost, before hard freeze | ✓ SAFE |

**Analysis:** Excellent timing. Garlic planted early October gets 4-6 weeks to establish roots before hard freeze. Broad beans (Aquadulce Claudia is overwinter variety) planted late October is standard for Zone 8. Mulching November 9 is 1 month after first frost - perfect.

### ✅ Summer Harvest (2027)

| Date | Activity | Crop | Climate Check | Status |
|------|----------|------|---------------|--------|
| 2027-06-21 | Harvest | Garlic | 8.5 months after planting | ✓ OPTIMAL |
| 2027-06-21 | Direct Sow | Bush Beans | Replacing harvested garlic | ✓ SAFE |

**Analysis:** Garlic harvest in late June is perfect timing (planted Oct 5, harvested Jun 21 = 259 days). Immediate replanting with beans maximizes bed use and provides late summer harvest.

---

## Summary

### Overall Assessment: **EXCELLENT** ✓

All planting dates align perfectly with Western Zealand climate data:

1. **Frost Safety:** All frost-sensitive crops planted after April 20 last frost date
2. **Cold-Hardy Timing:** Cold-hardy crops appropriately started in early-mid April
3. **Succession Spacing:** Bean and carrot successions well-timed for continuous harvest
4. **Fall Preparation:** Winter crops started with adequate time before frost
5. **Overwinter Crops:** Garlic and broad beans planted at optimal times for Zone 8
6. **Season Extension:** Proper use of greenhouse starting in March

### Climate Trends Consideration

Given the warming trend (warmest March/April in 10+ years), the schedule is:
- **Conservative:** Using April 20 last frost maintains safety margin
- **Adaptable:** If last frost shifts to April 15, transplants on May 4 still appropriate
- **Flexible:** Greenhouse starts in late March allow earlier transplanting if weather permits

### Risk Factors: MINIMAL

- **Late frost risk:** May 4 transplants have 2-week buffer
- **Early frost risk:** Fall crops harvested before October 10 or are frost-tolerant
- **Heat stress risk:** Tomatoes may need shade if extreme heat continues (>30°C)
- **Overwintering risk:** Broad beans and garlic are appropriate for Zone 8 winters

### Recommendations

1. **Monitor:** Track actual 2026 last frost date to refine 2027 schedule
2. **Row covers:** Keep available for May 1-15 in case of late cold snap
3. **Shade cloth:** Consider for tomatoes if July temperatures exceed 32°C
4. **Documentation:** Note harvest dates in 2026 to validate timing for 2027

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## Climate Data Sources

All validations based on:
- `climate-data-western-zealand.md` (Last frost: Apr 20, First frost: Oct 10)
- [When to Plant Vegetables in Copenhagen - Garden.org](https://garden.org/apps/calendar/?q=copenhagen)
- [Denmark Hardiness Zones - PlantMaps](https://www.plantmaps.com/interactive-denmark-hardiness-zone-map-celsius.php)
- [Growing Vegetables In Denmark - GardeningTips.in](https://gardeningtips.in/growing-vegetables-in-denmark-planting-calendar)

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*Validated: January 2026*
*Next validation: January 2027 (after observing actual 2026 frost dates)*